Question

我在viewDidLoad方法中编写了以下代码：

categoryPickerView=[[UIPickerView alloc]init];
categoryPickerView.alpha = 0;
[self.view addSubview:categoryPickerView];
categoryPickerView.delegate=self;
categoryPickerView.tag=1;

并调用此方法隐藏选择器视图

- (IBAction)hidePickerView:(id)sender {
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.6];
    CGAffineTransform transfrom = CGAffineTransformMakeTranslation(0, 200);
    categoryPickerView.transform = transfrom;
    categoryPickerView.alpha = categoryPickerView.alpha * (-1) + 1;
    [UIView commitAnimations];
}

我的问题是我想在选择器视图上显示“完成”按钮，选择器视图应该隐藏在按钮点击上。

Answer 1

您可以使用此代码

UIToolbar *toolBar= [[UIToolbar alloc] initWithFrame:CGRectMake(0,0,320,44)];
[toolBar setBarStyle:UIBarStyleBlackOpaque];
UIBarButtonItem *barButtonDone = [[UIBarButtonItem alloc] initWithTitle:@"Done" 
    style:UIBarButtonItemStyleBordered target:self action:@selector(changeDateFromLabel:)];
toolBar.items = @[barButtonDone];
barButtonDone.tintColor=[UIColor blackColor];
[pickerView addSubview:toolBar];
//(or)pickerView.inputAccessoryView = toolBar;

并为changeDateFromLabel:

设置按钮操作方法

-(void)changeDateFromLabel:(id)sender
{
   [[your UI Element] resignFirstResponder];
}

Answer 2

您可以使用“完成”按钮创建视图并添加工具栏，并使用UIPickerView作为子视图

- (void)createInputView {
    CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width;

    UIToolbar *toolBar= [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, screenWidth, 44)];
    [toolBar setBarStyle:UIBarStyleDefault];
    UIBarButtonItem *flex = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];

    UIBarButtonItem *barButtonDone = [[UIBarButtonItem alloc] initWithTitle:@"Done"
                                                                  style:UIBarButtonItemStyleBordered
                                                                 target:self
                                                                 action:@selector(doneClicked)];
    toolBar.items = @[flex, barButtonDone];
    barButtonDone.tintColor = [UIColor blackColor];

    UIPickerView *picker = [[UIPickerView alloc] initWithFrame:CGRectMake(0, toolBar.frame.size.height, screenWidth, 200)];
    picker.delegate = self;
    picker.dataSource = self;
    picker.showsSelectionIndicator = YES;


    UIView *inputView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, screenWidth, toolBar.frame.size.height + picker.frame.size.height)];
    inputView.backgroundColor = [UIColor clearColor];
    [inputView addSubview:picker];
    [inputView addSubview:toolBar];

    textField.inputView = inputView;
}

- (void)doneClicked {
    [textField resignFirstResponder];
}

Answer 3

您需要使用UIToolbar作为附件视图：试试这个：

#pragma mark - PickerView for Location Selection

- (UIPickerView *)locationsPicker {
    if ( locationsPicker == nil ) {
        locationsPicker = [[UIPickerView alloc] init];
        locationsPicker.delegate = self;
        locationsPicker.dataSource = self;
        locationsPicker.showsSelectionIndicator = YES;
    }
    return locationsPicker;
}

- (UIToolbar *)accessoryView {
    if ( accessoryView == nil ) {
        accessoryView = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];

        UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
                                       UIBarButtonSystemItemDone
                                       target:self
                                       action:@selector(onLocationSelection)];
        [accessoryView setItems:[NSArray arrayWithObject:doneButton]];
    }
    return accessoryView;
}

- (void)onLocationSelection {
    NSInteger row = [self.locationsPicker selectedRowInComponent:0];
    if ( [Location isFirstResponder] ) {
       NSLog(@"%@", [listOfLocations objectAtIndex:row]);
        [Location resignFirstResponder];
    }
}

Answer 4

可复制粘贴的解决方案！

这适用于iOS 10（也可能是其他版本）我在9/4/2017写了这段代码。

我需要结合其他答案来获取我想要的内容，这是一个$row=mysqli_fetch_assoc($sql_result);按钮，Cancel按钮，以及一个可以在按钮上显示/隐藏的选择器视图。忽略我的屏幕截图在选择器中只有一个项目的事实..我的数组中只有一个项目。我测试过多个项目，效果很好。

免责声明！我已经测试并使用了这段代码。我在我的例子中概括了名字，所以如果我错过了一个并且他们的财产名称没有排队，我会提前道歉。

为了拥有一个按钮上显示的pickerView，您需要在视图控制器的任何位置创建一个类型为Done的dummyTextField 。这是因为{{ 1}}用于与UITextFields一起使用。要模仿选择器的显示和隐藏，您的按钮点击需要调用dummyTextField的UITextField和UIPickerView方法。例子如下）

第一步

创建自定义数据源类。 MyObj是您想要在选择器中显示项目的类。

在.h：

becomeFirstResponder

在.m：

resignFirstResponder

第二步在视图控制器中，导入自定义数据源，委托和设置属性:(您必须包含文本字段委托！）

#import <UIKit/UIKit.h>
@class myObj;

@interface PickerDataSource : NSObject <UIPickerViewDataSource, UIPickerViewDelegate>
@property (nonatomic, strong) MyObj *selectedObject;
@end

第三步

在#import "PickerDataSource.h" #import "MyObj.h" @implementation PickerDataSource - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { self.selectedObject = mySourceArray[row]; } - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component { return mySourceArray.count; } - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView { return 1; } - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { return ((MyObj *)mySourceArray[row]).myTitle; } - (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component { int sectionWidth = 300; return sectionWidth; } @end中，拨打#import "PickerDataSource.h" @interface MyViewController () <UIPickerViewDelegate, UITextFieldDelegate> @property (strong, nonatomic) PickerDataSource *pickerDataSource; @property (strong, nonatomic) UIPickerView *picker; @property (strong, nonatomic) UITextField *dummyTextField; @end（您接下来会创建此方法）

第四步

创建viewDidLoad

[self setupPicker];

第五步

创建setupPicker

- (void)setupPicker {
    // init custom picker data source
    self.pickerDataSource = [PickerDataSource new];
    // init custom picker
    self.picker = [UIPickerView new];
    // set the picker's dataSource and delegate to be your custom data source
    self.picker.dataSource = self.pickerDataSource;
    self.picker.delegate = self.pickerDataSource;
    self.picker.showsSelectionIndicator = YES;

    // next step is to write this configure method getting called here
    [self configurePickerSubviews];

    // lastly, add the dummyTextField to your view.
    [self.view addSubview:self.dummyTextField];
}

第六步

配置configurePickerSubviews，以便从源阵列中提取要显示的数据。

第7步

点击- (void)configurePickerSubviews { // A UIPickerView must be added as an inputView to a UITextField in order to be displayed on button tap // So you need to create a dummyTextField to do so. self.dummyTextField = [UITextField new]; // Create a toolbar to add a done button UIToolbar *toolBar= [[UIToolbar alloc] initWithFrame:CGRectMake(0,0,[UIScreen mainScreen].bounds.size.width,44)]; [toolBar setBarStyle:UIBarStyleDefault]; UIBarButtonItem *done = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStylePlain target:self action:@selector(locationPressed)]; // Create a flex space so that done button will be right aligned UIBarButtonItem *flex = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil]; UIBarButtonItem *cancel = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonItemStylePlain target:self action:@selector(dismissPicker)]; toolBar.items = @[cancel, flex, done]; done.tintColor = [UIColor blackColor]; [self.picker addSubview:toolBar]; // Create an input view to add picker + done button as subviews UIView *inputView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, self.picker.frame.size.height + 44)]; [self.picker setFrame:CGRectMake(0, 0, inputView.frame.size.width, inputView.frame.size.height)]; inputView.backgroundColor = [UIColor clearColor]; [inputView addSubview:self.picker]; [inputView addSubview:toolBar]; // Set custom inputView as container for picker view self.dummyTextField.inputView = inputView; // Hiding the textfield will hide the picker [self.dummyTextField setHidden:YES]; }！

Answer 5

UIToolbar使用＆＃39;完成＆＃39;按钮应添加到成为第一响应者的视图的inputAccessoryView。由于UIView类继承自UIResponder，因此任何视图都可能包含inputView和inputAccessoryView。因此，您可以使用UIResponder的键盘显示/隐藏动画附带的默认动画行为，而不是以编程方式手动执行动画。

对UIView进行子类化并覆盖inputView和inputAccessoryView属性并将其设为readwrite。在这个例子中，我将子类化UITableViewCell。

// FirstResponderTableViewCell.h
@interface FirstResponderTableViewCell : UITableViewCell
@property (readwrite, strong, nonatomic) UIView *inputView;
@property (readwrite, strong, nonatomic) UIView *inputAccessoryView;
@end

覆盖子类中的canBecomeFirstResponder＆＃39;实施

// FirstResponderTableViewCell.m
- (BOOL)canBecomeFirstResponder {
    return YES;
}

在视图控制器中，创建并指定选择器视图和输入附件工具栏

// MyViewController.m
- (void)viewDidLoad {
    [super viewDidLoad];
    UIPickerView *pickerView = [[UIPickerView alloc] init];
    UIToolbar *accessoryToolbar = [UIToolbar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44)];
    // Configure toolbar .....

    // note: myFirstResponderTableViewCell is an IBOutlet to a static cell in storyboard of type FirstResponderTableViewCell
    self.myFirstResponderTableViewCell.inputView = pickerView;
    self.myFirstResponderTableViewCell.inputAccessoryView = accessoryToolbar;
}

请勿忘记在需要时将第一响应者分配给视图（例如内部 - tableView:didSelectRowAtIndexPath:）
```
[self.myFirstResponderTableViewCell becomeFirstResponder];
```

希望这有帮助。

参考：http://blog.swierczynski.net/2010/12/how-to-create-uipickerview-with-toolbar-above-it-in-ios/

Answer 6

试试这个。

UIPickerView *cityPicker = [[UIPickerView alloc] initWithFrame:CGRectZero];
cityPicker.delegate = self;
cityPicker.dataSource = self;
[cityPicker setShowsSelectionIndicator:YES];
txtText.inputView = cityPicker;
// Create done button in UIPickerView
UIToolbar*  mypickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 56)];
mypickerToolbar.barStyle = UIBarStyleBlackOpaque;
[mypickerToolbar sizeToFit];
NSMutableArray *barItems = [[NSMutableArray alloc] init];
UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
[barItems addObject:flexSpace];
UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(pickerDoneClicked)];
[barItems addObject:doneBtn];
[mypickerToolbar setItems:barItems animated:YES];
txtText.inputAccessoryView = mypickerToolbar;  // set the toolbar as input accessory view  for uitextfield, not the pickerview.

http://technopote.com/how-to-make-multiple-uipickerview-in-a-single-view/

Answer 7

 #import "ViewController.h"

 @interface ViewController ()<UIPickerViewDelegate>
 {
UIPickerView *myPickerView;
NSArray *namesArray ;

 }
 @end

 @implementation ViewController

 -(void)viewDidLoad
 {
 [super viewDidLoad];
    namesArray=[[NSArray alloc]initWithObjects:@"a",@"b", nil];
   [self popoverWithInformation];


  }

 -(void)popoverWithInformation
 {
UIToolbar *pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
pickerToolbar.barStyle = UIBarStyleBlackOpaque;
[pickerToolbar sizeToFit];
NSMutableArray *barItems = [[NSMutableArray alloc] init];


UIBarButtonItem *cancelBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(pickerCancel:)];
[barItems addObject:cancelBtn];

UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
[barItems addObject:flexSpace];

UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(pickerDone:)];
[barItems addObject:doneBtn];



[pickerToolbar setItems:barItems animated:YES];


myPickerView = [[UIPickerView alloc] init];
myPickerView.delegate = self;
myPickerView.showsSelectionIndicator = YES;
CGRect pickerRect = myPickerView.bounds;
myPickerView.bounds = pickerRect;
myPickerView.frame = CGRectMake(0, 44, 320, 216);

UIView* popoverView = [[UIView alloc] initWithFrame:CGRectMake(0, 44, 320, 300)];
popoverView.backgroundColor = [UIColor whiteColor];
[popoverView addSubview:myPickerView];

[popoverView addSubview:pickerToolbar];
[self.view addSubview:popoverView];
 }
 -(void)pickerView:(UIPickerView *)pickerView didSelectRow: (NSInteger)row inComponent:(NSInteger)component {


 }

 // tell the picker how many rows are available for a given component
 -(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {

  return namesArray.count;
 }

 // tell the picker how many components it will have
 -(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 1;
 }

 // tell the picker the title for a given component
 -(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {




return namesArray[row];
 }

 // tell the picker the width of each row for a given component
 -(CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
int sectionWidth = 300;

return sectionWidth;
 }

 -(void)pickerDone:(id)sender
 {


 }
 -(void)pickerCancel:(id)sender
 {


 }

在UIPickerview上显示完成按钮

7 个答案: