UIPickerView 在 ActionSheet 上的奇怪行为

Posted 2023-02-24

【中文标题】UIPickerView 在 ActionSheet 上的奇怪行为

【英文标题】：odd behavior of UIPickerView on ActionSheet

【发布时间】：2012-08-05 09:59:15

【问题描述】：

- (void) actionsheetstart

    actionSheet=[[UIActionSheet alloc] initWithTitle:@"" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];
    [actionSheet showInView:self.view];
    UIToolbar *pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 480, 32)];
    [pickerToolbar sizeToFit];
    pickerToolbar.barStyle = UIBarStyleBlackTranslucent;
    NSMutableArray *barItems = [[NSMutableArray alloc] init];

    UIBarButtonItem *cancelBtn = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonSystemItemCancel target:self action:@selector(cancel_clicked:)];
    [barItems addObject:cancelBtn];
    UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
    [barItems addObject:flexSpace];
    UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(done_clicked:)];
    [barItems addObject:doneBtn];
    [pickerToolbar setItems:barItems animated:YES];
    [actionSheet addSubview:pickerToolbar];

    UIPickerView *picker = [[UIPickerView alloc] init];
    picker.frame = CGRectMake(0, 44, 320, 216);
    picker.delegate  = self;
    picker.dataSource = self;
    picker.showsSelectionIndicator = YES;
    [actionSheet addSubview:picker];


-(void)done_clicked:(id)sender

    [actionSheet dismissWithClickedButtonIndex:0 animated:YES];

-(void)cancel_clicked:(id)sender

    [actionSheet dismissWithClickedButtonIndex:0 animated:YES];

由于某种原因，操作表很好，但 UIPickerView 和 UIToolBar 变得疯狂。 我尝试将框架设置为 -px 但没有任何成功。似乎是什么问题？

非常感谢。

【参考方案1】：

不要在UIActionSheet 中插入UIPickerView，这样你不会得到正确的行为。我的解决方案：

子类UIButton，实现方法canBecomeFirstResponder:，返回YES。 在您的子类UIButton 中实现inputView 方法，返回UIPickerView。 （可选）在您的子类按钮中实现inputAccessoryView 方法以返回您的选择器上方的工具栏。 点击时将您的按钮设为becomeFirstResponder:。

瞧，当点击按钮时，您的选择器会像键盘一样模态显示。

编辑：

MyButton.h

#import <UIKit/UIKit.h>

@interface MyButton : UIButton

@end

MyButton.m

#import "MyButton.h"

@implementation MyButton 
    UIDatePicker *_pv;


- (BOOL)canBecomeFirstResponder 
    return YES;


#pragma mark - Picker

- (UIView *)inputView 
    // set up your UIPickerView here
    _pv = [[UIDatePicker alloc] init];
    [_pv setDatePickerMode:UIDatePickerModeTime];
    [_pv setMinuteInterval:30];
    return _pv;


- (UIView *)inputAccessoryView 
    // set up your toolbar here
    UIToolbar *tb = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
    UIBarButtonItem *flex = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
    UIBarButtonItem *ok = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(pick:)];
    [tb setItems:[NSArray arrayWithObjects:flex, ok, nil]];
    return tb;


- (void)pick:(id)sender 
    // store picker value here before closing inputView
    [self resignFirstResponder];

@end

【讨论】：

我是 Obj-C 的新手，我真的不知道该怎么做。 :( 不过还是谢谢。

抱歉，让您久等了。有关示例实现，请参阅我上面的编辑。