UIActionSheet 中的 UIPickerView：UI 冻结

Posted 2023-02-24

【中文标题】UIActionSheet 中的 UIPickerView：UI 冻结

【英文标题】：UIPickerView in a UIActionSheet: UI freezes

【发布时间】：2012-01-23 05:29:18

【问题描述】：

每当我触发带有UIPickerView 的UIActionSheet 时，我的ios 应用程序就会冻结。选择器滚轮滚动正常，直到我尝试点击UIActionSheet 上的“完成”按钮，此时 UI 冻结。但是，XCode 并没有在程序中记录任何类型的崩溃，所以我很困惑。

以前有没有其他人遇到过这个问题？我该如何解决？

【参考方案1】：

我从来没有遇到过这种类型的问题。我认为这个问题可以帮助您解决问题。我以同样的方式使用了 PickerView

UIActionSheet *actionSheet;
NSString *pickerType;

- (void)createActionSheet 
    if (actionSheet == nil) 
        // setup actionsheet to contain the UIPicker
        actionSheet = [[UIActionSheet alloc] initWithTitle:@"Select"
                                                  delegate:self
                                         cancelButtonTitle:nil
                                    destructiveButtonTitle:nil
                                         otherButtonTitles:nil];

        UIToolbar *pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
        pickerToolbar.barStyle = UIBarStyleBlackOpaque;
        [pickerToolbar sizeToFit];

        NSMutableArray *barItems = [[NSMutableArray alloc] init];

        UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
        [barItems addObject:flexSpace];
        [flexSpace release];

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

        [pickerToolbar setItems:barItems animated:YES];
        [barItems release];

        [actionSheet addSubview:pickerToolbar];
        [pickerToolbar release];

        [actionSheet showInView:self.view];
        [actionSheet setBounds:CGRectMake(0,0,320, 464)];
    


-(IBAction)BtnPressed:(id)sender

    [self createActionSheet];
    pickerType = @"picker";
    select = NO;
    UIPickerView *chPicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0, 44.0, 0.0, 0.0)];
    chPicker.dataSource = self;
    chPicker.delegate = self;
    chPicker.showsSelectionIndicator = YES;
    [actionSheet addSubview:chPicker];
    sessoTxt.text = [sessoArray objectAtIndex:0];
    [chPicker release];



#pragma mark UIPickerViewDelegate Methods

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView 
    return 1;


- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component

    int count;
    if ([pickerType isEqualToString:@"picker"])
        count = [array count];
return count;


- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component 
    NSString *string;

    if ([pickerType isEqualToString:@"picker"])
        string = [array objectAtIndex:row];

return string;

// Set the width of the component inside the picker
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component             
    return 300;


// Item picked
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component 
    select = YES;
    if ([pickerType isEqualToString:@"picker"])
    
        Txt.text = [array objectAtIndex:row];
    


- (void)pickerDone:(id)sender

    if(select == NO)
    
        if ([pickerType isEqualToString:@"picker"])
        
            Txt.text = [array objectAtIndex:0];
        

    [actionSheet dismissWithClickedButtonIndex:0 animated:YES];
    [actionSheet release];
    actionSheet = nil;