Question

我是ios的新手。我最近尝试过scrollview。但滚动视图的所有子视图都显示在导航栏后面。我在3d视图中进行了检查，但确定了一个断点。我从viewDidLoad调用此方法。帮助

#import "AddContactViewController.h"
#import "NSStringCategory.h"
#import "ContactList.h"
#import "AddContactDelegate.h"
#import "ContactsListViewController.h"
#import "ContactDisplayingViewController.h"
#import "Contact.h"
@interface AddContactViewController ()
@property NSMutableArray * textFields;
@property UIDatePicker *inputViewDatePicker;
@property UIDatePicker *inputViewDatePicker1;
@property UIScrollView * scrollView;
@end

@implementation AddContactViewController
#pragma mark - Setting up the view
-(void)createView{
    /*CGFloat x = 0;
    CGFloat y = self.navigationController.navigationBar.frame.size.height;
    CGFloat widthCG = self.view.frame.size.width;
    CGFloat heightCG = self.view.frame.size.height;*/
    NSLayoutConstraint * myConstraint;
    //Date pickers
    self.inputViewDatePicker = [[UIDatePicker alloc]init];
    self.inputViewDatePicker.datePickerMode = UIDatePickerModeDate;
    self.inputViewDatePicker1 = [[UIDatePicker alloc]init];
    self.inputViewDatePicker1.datePickerMode = UIDatePickerModeDate;
    [self.inputViewDatePicker addTarget:self action:@selector(datePickerChanged:) forControlEvents:UIControlEventValueChanged];
    [self.inputViewDatePicker1 addTarget:self action:@selector(expiryDatePickerChanged:) forControlEvents:UIControlEventValueChanged];
    self.scrollView = [[UIScrollView alloc]init];
    //self.scrollView.frame = self.view.frame;
//    self.scrollView.frame = CGRectMake(0, 0, 500, 500);
    NSLog(@"The frame of the view is %@",self.view.frame);
//    self.scrollView.contentSize = CGSizeMake(414,736);
    [self.view addSubview:self.scrollView];
    self.scrollView.translatesAutoresizingMaskIntoConstraints = NO;

    myConstraint = [NSLayoutConstraint constraintWithItem:self.scrollView attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeft multiplier:1 constant:0];
    [self.view addConstraint:myConstraint];

    myConstraint = [NSLayoutConstraint constraintWithItem:self.scrollView attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeRight multiplier:1 constant:0];
    [self.view addConstraint:myConstraint];

    myConstraint = [NSLayoutConstraint constraintWithItem:self.scrollView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeTop multiplier:1 constant:0];
    [self.view addConstraint:myConstraint];

    myConstraint = [NSLayoutConstraint constraintWithItem:self.scrollView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeBottom multiplier:1 constant:0];
    [self.view addConstraint:myConstraint];
    UILabel *name = [[UILabel alloc]init];
    [name setText:@"Name"];
    name.translatesAutoresizingMaskIntoConstraints = NO;

    [self.scrollView addSubview:name];
    self.nameTextField = [[UITextField alloc]init];
    self.nameTextField.placeholder = @"Name";
    myConstraint =[NSLayoutConstraint constraintWithItem:name
                                               attribute:NSLayoutAttributeBottom
                                               relatedBy:NSLayoutRelationEqual
                                                  toItem:self.scrollView
                                               attribute:NSLayoutAttributeBaseline
                                              multiplier:((float)2/10)
                                                constant:0];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:name attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeLeft multiplier:1 constant:10];
    [self.scrollView addConstraint:myConstraint];

    self.nameTextField.translatesAutoresizingMaskIntoConstraints = NO;
    self.nameTextField.borderStyle = UITextBorderStyleLine;
    NSLog(@"%@",[self.nameTextField class]);
    [self.scrollView addSubview:self.nameTextField];
    myConstraint =[NSLayoutConstraint constraintWithItem:self.nameTextField
                                               attribute:NSLayoutAttributeBottom
                                               relatedBy:NSLayoutRelationEqual
                                                  toItem:self.scrollView
                                               attribute:NSLayoutAttributeBaseline
                                              multiplier:((float)2/10)
                                                constant:0];
    [self.scrollView addConstraint:myConstraint];

    myConstraint = [NSLayoutConstraint constraintWithItem:self.nameTextField
                                                attribute:NSLayoutAttributeRight
                                                relatedBy:NSLayoutRelationEqual
                                                   toItem:self.scrollView
                                                attribute:NSLayoutAttributeRight
                                               multiplier:1
                                                 constant:-10];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.nameTextField
                                                attribute:NSLayoutAttributeWidth
                                                relatedBy:NSLayoutRelationEqual
                                                   toItem:self.scrollView
                                                attribute:NSLayoutAttributeWidth
                                               multiplier:((float)0.65)
                                                 constant:0];
    [self.scrollView addConstraint:myConstraint];


    //Second Name
    UILabel *secondName = [[UILabel alloc]init];
    [secondName setText:@"Second Name"];
    [secondName sizeToFit];
    [self.scrollView addSubview:secondName];
    self.secondNameTextField = [[UITextField alloc]init];
    self.secondNameTextField.placeholder = @"Second Name";
    myConstraint =[NSLayoutConstraint constraintWithItem:secondName
                                               attribute:NSLayoutAttributeBottom
                                               relatedBy:NSLayoutRelationEqual
                                                  toItem:self.scrollView
                                               attribute:NSLayoutAttributeBaseline
                                              multiplier:((float)3.5/10)
                                                constant:0];
    secondName.translatesAutoresizingMaskIntoConstraints = NO;
    [self.scrollView addConstraint:myConstraint];

    myConstraint = [NSLayoutConstraint constraintWithItem:secondName attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeLeft multiplier:1 constant:10];
    myConstraint =[NSLayoutConstraint constraintWithItem:self.secondNameTextField
                                               attribute:NSLayoutAttributeBottom
                                               relatedBy:NSLayoutRelationEqual
                                                  toItem:self.scrollView
                                               attribute:NSLayoutAttributeBaseline
                                              multiplier:((float)3.5/10)
                                                constant:0];
    [self.scrollView addSubview:self.secondNameTextField];
    [self.scrollView addConstraint:myConstraint];
    self.secondNameTextField.translatesAutoresizingMaskIntoConstraints = NO;
    self.secondNameTextField.borderStyle = UITextBorderStyleLine;
    myConstraint = [NSLayoutConstraint constraintWithItem:self.secondNameTextField
                                                attribute:NSLayoutAttributeRight
                                                relatedBy:NSLayoutRelationEqual
                                                   toItem:self.scrollView
                                                attribute:NSLayoutAttributeRight
                                               multiplier:1
                                                 constant:-10];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.secondNameTextField
                                                attribute:NSLayoutAttributeWidth
                                                relatedBy:NSLayoutRelationEqual
                                                   toItem:self.scrollView
                                                attribute:NSLayoutAttributeWidth
                                               multiplier:((float)0.65)
                                                 constant:0];
    [self.scrollView addConstraint:myConstraint];


    //Email
    self.emailTextField = [[UITextField alloc]init];
    UILabel *email = [[UILabel alloc]init];
    [email setText:@"Email"];
    [self.scrollView addSubview:email];
    myConstraint =[NSLayoutConstraint constraintWithItem:email
                                               attribute:NSLayoutAttributeBottom
                                               relatedBy:NSLayoutRelationEqual
                                                  toItem:[email superview]
                                               attribute:NSLayoutAttributeBaseline
                                              multiplier:((float)5/10)
                                                constant:0];
    email.translatesAutoresizingMaskIntoConstraints = NO;
    self.emailTextField.translatesAutoresizingMaskIntoConstraints = NO;
    self.emailTextField.borderStyle = UITextBorderStyleLine;
    self.emailTextField.placeholder = @"Email";

    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:email attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeLeft multiplier:1 constant:10];
    [self.scrollView addConstraint:myConstraint];
    [self.scrollView addSubview:self.emailTextField];

    myConstraint =[NSLayoutConstraint constraintWithItem:self.emailTextField
                                               attribute:NSLayoutAttributeBottom
                                               relatedBy:NSLayoutRelationEqual
                                                  toItem:self.scrollView
                                               attribute:NSLayoutAttributeBaseline
                                              multiplier:((float)5/10)
                                                constant:0];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.emailTextField attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeRight multiplier:1 constant:-10];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.emailTextField attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeWidth multiplier:((float)0.65) constant:0];
    [self.scrollView addConstraint:myConstraint];


    //Number
    UILabel * number = [[UILabel alloc]init];
    number.translatesAutoresizingMaskIntoConstraints = NO;
    [number setText:@"Number"];
    [self.scrollView addSubview:number];
    myConstraint =[NSLayoutConstraint constraintWithItem:number
                                               attribute:NSLayoutAttributeBottom
                                               relatedBy:NSLayoutRelationEqual
                                                  toItem:[number superview]
                                               attribute:NSLayoutAttributeBaseline
                                              multiplier:((float)6.5/10)
                                                constant:0];
    self.numberTextField.translatesAutoresizingMaskIntoConstraints = NO;
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:number attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeLeft multiplier:1 constant:10];
    [self.scrollView addConstraint:myConstraint];
    self.numberTextField = [[UITextField alloc]init];
    self.numberTextField.placeholder = @"Number";
    self.numberTextField.translatesAutoresizingMaskIntoConstraints = NO;
    self.numberTextField.borderStyle = UITextBorderStyleLine;
    myConstraint =[NSLayoutConstraint constraintWithItem:self.numberTextField
                                               attribute:NSLayoutAttributeBottom
                                               relatedBy:NSLayoutRelationEqual
                                                  toItem:self.scrollView
                                               attribute:NSLayoutAttributeBaseline
                                              multiplier:((float)6.5/10)
                                                constant:0];
    [self.scrollView addSubview:self.numberTextField];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.numberTextField attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeRight multiplier:1 constant:-10];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.numberTextField attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeWidth multiplier:((float)0.65) constant:0];
    [self.scrollView addConstraint:myConstraint];


    //Date of Birth
    NSDate *now = [[NSDate alloc]init];
    NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"YYYY:MM:dd"];
    self.theDob = [[UITextField alloc]init];
    self.theDob.translatesAutoresizingMaskIntoConstraints = NO;
    self.theDob.borderStyle = UITextBorderStyleLine;
    //[self.theDob addTarget:self action:@selector(DobTapped:) forControlEvents:UIControlEventAllTouchEvents];
    self.theDob.userInteractionEnabled = true;
    self.theDob.enabled = true;
    self.theDob.inputView = self.inputViewDatePicker;
    self.theDob.text = [dateFormatter stringFromDate:now];
    NSLog(@"The date is %@",[dateFormatter stringFromDate:now]);
    [self.scrollView addSubview: self.theDob];
    myConstraint =[NSLayoutConstraint constraintWithItem:self.theDob
                                               attribute:NSLayoutAttributeBottom
                                               relatedBy:NSLayoutRelationEqual
                                                  toItem:self.scrollView
                                               attribute:NSLayoutAttributeBaseline
                                              multiplier:((float)8/10)
                                                constant:0];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.theDob attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeRight multiplier:1 constant:-10];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.theDob attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeWidth multiplier:((float)0.65) constant:0];
    [self.scrollView addConstraint:myConstraint];
    UILabel *dob = [[UILabel alloc]init];
    [dob setText:@"DOB"];
    [self.scrollView addSubview:dob];
    myConstraint =[NSLayoutConstraint constraintWithItem:dob
                                               attribute:NSLayoutAttributeBottom
                                               relatedBy:NSLayoutRelationEqual
                                                  toItem:[dob superview]
                                               attribute:NSLayoutAttributeBaseline
                                              multiplier:((float)8/10)
                                                constant:0];
    dob.translatesAutoresizingMaskIntoConstraints = NO;
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:dob attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeLeft multiplier:1 constant:10];
    [self.scrollView addConstraint:myConstraint];


    //Expiry Date
    self.expirydate = [[UITextField alloc]init];
    self.expirydate.translatesAutoresizingMaskIntoConstraints = NO;
    [self.scrollView addSubview: self.expirydate];
    myConstraint =[NSLayoutConstraint constraintWithItem:self.expirydate
                                               attribute:NSLayoutAttributeBottom
                                               relatedBy:NSLayoutRelationEqual
                                                  toItem:self.scrollView
                                               attribute:NSLayoutAttributeBaseline
                                              multiplier:((float)9.5/10)
                                                constant:0];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.expirydate attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeRight multiplier:1 constant:-10];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.expirydate attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeWidth multiplier:((float)0.65) constant:0];
    self.expirydate.text = [dateFormatter stringFromDate:now];
    self.expirydate.userInteractionEnabled = true;
    self.expirydate.enabled = true;
    self.expirydate.borderStyle = UITextBorderStyleLine;
    self.expirydate.text = [dateFormatter stringFromDate:[[NSDate alloc]init] ];
    self.expirydate.inputView = self.inputViewDatePicker1;
    [self.scrollView addConstraint:myConstraint];
    UILabel *expiryDate = [[UILabel alloc]init];
    [expiryDate setText:@"Expiry Date"];
    [expiryDate sizeToFit];
    [self.scrollView addSubview:expiryDate];
    NSLog(@"%@",NSStringFromCGRect(self.scrollView.frame));
    NSLog(@"%@",NSStringFromCGRect(self.nameTextField.frame));
    NSLog(@"%@ super class",[self.scrollView superview]);
    NSLog(@"the scroll super class %@",[self.nameTextField superview]);
    myConstraint =[NSLayoutConstraint constraintWithItem:expiryDate
                                               attribute:NSLayoutAttributeBottom
                                               relatedBy:NSLayoutRelationEqual
                                                  toItem:self.scrollView
                                               attribute:NSLayoutAttributeBaseline
                                              multiplier:((float)9.5/10)
                                                constant:0];
    expiryDate.translatesAutoresizingMaskIntoConstraints = NO;
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:expiryDate attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self.scrollView attribute:NSLayoutAttributeLeft multiplier:1 constant:10];
    [self.scrollView addConstraint:myConstraint];
    //[self.scrollView addSubview:self.scrollView];

    //Navigation Buttons
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"Save" style:UIBarButtonItemStylePlain target:self action:@selector(saveContact:)];

    myConstraint = [NSLayoutConstraint constraintWithItem:self.nameTextField attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:name attribute:NSLayoutAttributeRight multiplier:1 constant:20];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.emailTextField attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:email attribute:NSLayoutAttributeRight multiplier:1 constant:20];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.secondNameTextField attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:secondName attribute:NSLayoutAttributeRight multiplier:1 constant:20];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.numberTextField attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:number attribute:NSLayoutAttributeRight multiplier:1 constant:20];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.theDob attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:dob attribute:NSLayoutAttributeRight multiplier:1 constant:20];
    [self.scrollView addConstraint:myConstraint];
    myConstraint = [NSLayoutConstraint constraintWithItem:self.expirydate attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:expiryDate attribute:NSLayoutAttributeRight multiplier:1 constant:20];
    [self.scrollView addConstraint:myConstraint];
}

Answer 1

您可以尝试以下

[self.navigationController.navigationBar setTranslucent:NO];

这样，self.view的子视图都不会位于UINavigationBar后面。

如果它没有帮助或者你正在寻找其他东西，请告诉我。

Answer 2

你的问题的一部分 - 你正在设置相对于滚动视图的NSLayoutAttributeBaseline的对象的约束...我相信，这总是为0。

我建议你尝试让第一个标签显示在你想要的位置。之后，一次添加一个元素，使用约束将它们相对于第一个标签定位。

试试这个第一个约束：

myConstraint =[NSLayoutConstraint constraintWithItem:name
                                           attribute:NSLayoutAttributeBaseline
                                           relatedBy:NSLayoutRelationEqual
                                              toItem:self.scrollView
                                           attribute:NSLayoutAttributeTop
                                          multiplier:1
                                            constant:20];

应该将“名称”标签的基线放在距离滚动视图顶部20点的位置。

添加滚动视图时，所有视图都显示在导航栏后面的self.view顶部

2 个答案: