Question

在我的项目中，我有一个UIButton和一个UIView，在视图中我添加了UIDatePicker。当我按下按钮时，日期选择器打开。如何解雇日期选择器？

Answer 1

我希望以下代码能解决您的问题。这解雇了日期选择器＆＃34; Done＆＃34;按钮点击以及在叠加视图上点击外部：

#import "ViewController.h"

#define kOverlayviewTag     1
#define kDatepickerTag      2
#define kToolbarTag         3

#define kToolbarHeight      44
#define kDatepickerHeight   216
#define kGenericWidth       320
#define kInvisibleAlpha     0
#define kTransparentAlpha   0.5
#define kOpaqueAlpha        1


@interface ViewController ()

-(IBAction)buttonTapped:(id)sender;

@end

@implementation ViewController

-(void)buttonTapped:(id)sender
{
    if ([self.view viewWithTag:kOverlayviewTag]) {
        return;
    }

    UIView *overlayView = [[UIView alloc] initWithFrame:self.view.bounds];
    overlayView.alpha = kInvisibleAlpha;
    overlayView.backgroundColor = [UIColor blackColor];
    overlayView.tag = kOverlayviewTag;

    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissDatePicker:)];
    [overlayView addGestureRecognizer:tapGesture];
    [self.view addSubview:overlayView];

    UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, self.view.bounds.size.height+kToolbarHeight, kGenericWidth, kDatepickerHeight)];
    datePicker.tag = kDatepickerTag;
    [datePicker addTarget:self action:@selector(changeDate:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:datePicker];

    UIToolbar *toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, self.view.bounds.size.height, kGenericWidth, kToolbarHeight)];
    toolBar.tag = kToolbarTag;
    toolBar.barStyle = UIBarStyleBlackTranslucent;
    UIBarButtonItem *spacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissDatePicker:)];
    [toolBar setItems:[NSArray arrayWithObjects:spacer, doneButton, nil]];
    [self.view addSubview:toolBar];


    CGRect toolbarTargetFrame = CGRectMake(0, self.view.bounds.size.height-kDatepickerHeight-kToolbarHeight, kGenericWidth, kToolbarHeight);
    CGRect datePickerTargetFrame = CGRectMake(0, self.view.bounds.size.height-kDatepickerHeight, kGenericWidth, kDatepickerHeight);
    [UIView animateWithDuration:0.5 animations:^{
        toolBar.frame = toolbarTargetFrame;
        datePicker.frame = datePickerTargetFrame;
        overlayView.alpha = kTransparentAlpha;
    }];


}

- (void)dismissDatePicker:(id)sender {
    CGRect toolbarTargetFrame = CGRectMake(0, self.view.bounds.size.height, kGenericWidth, kToolbarHeight);
    CGRect datePickerTargetFrame = CGRectMake(0, self.view.bounds.size.height+kToolbarHeight, kGenericWidth, kDatepickerHeight);

    [UIView animateWithDuration:0.5 animations:^{
        [self.view viewWithTag:kOverlayviewTag].alpha = kInvisibleAlpha;
        [self.view viewWithTag:kDatepickerTag].frame = datePickerTargetFrame;
        [self.view viewWithTag:kToolbarTag].frame = toolbarTargetFrame;
    } completion:^(BOOL finished) {
        [[self.view viewWithTag:kOverlayviewTag] removeFromSuperview];
        [[self.view viewWithTag:kToolbarTag] removeFromSuperview];
        [[self.view viewWithTag:kDatepickerTag] removeFromSuperview];
    }];
}


- (void)changeDate:(UIDatePicker *)sender {
    NSLog(@"New Date: %@", sender.date);
}

使用UIDatePicker pop up after UIButton is pressed

中的UIAnimation块更新

Answer 2

我通常做的是在UIDatePicker的顶部添加一个工具栏。在工具栏中，我添加了一个按钮，该按钮调用方法在按下时关闭日期选择器。

您还可以在UIDatePicker实例下添加UIView实例，并实现touchesBegan方法来关闭UIDatePicker。这样，当用户点击日期选择器之外时，它会调用关闭datepicker的touchesBegan方法。

在外面点击时Xcode UIDatePicker关闭

2 个答案: