objective-c - UIPickerView 在 ActionSheet 上的奇怪行为

Question

- (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];
}

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

非常感谢。

Answer 1

不要在 UIActionSheet 中插入 UIPickerView，这样您将无法获得正确的行为。我的解决方案:

1. 子类UIButton，实现方法canBecomeFirstResponder:，返回YES。
2. 在子类UIButton中实现inputView方法，返回UIPickerView。
3. 可选地，在您的子类按钮中实现 inputAccessoryView 方法以返回选择器上方的工具栏。
4. 让您的按钮成为FirstResponder:被点击时。

瞧，当点击按钮时，你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

我的按钮.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