我在可可触摸应用程序中的按钮没有正确返回我的位置

Posted 2023-03-21

【中文标题】我在可可触摸应用程序中的按钮没有正确返回我的位置

【英文标题】：My button in cocoa touch app is not returning my position correctly

【发布时间】：2011-10-16 23:35:47

【问题描述】：

我有一个应用程序，其按钮覆盖整个屏幕，并且在此按钮顶部有较小的按钮。当我按下按钮时，我写了一个显示手指位置的文本，但是当我将手指放在某些区域时，我看不到任何东西，按钮停止工作（屏幕的右下方区域）我确定在那里那里什么都没有。代码如下：

.h 文件：

    UIButton *BigButton;

    CGPoint FingerPos;
    bool isFingerDown;
    UILabel *FingerPosLabel;

-(void)Update;
-(IBAction)FingerMoved:(id)sender withEvent:(UIEvent*)event;
-(IBAction)FingerPressed:(id)sender withEvent:(UIEvent*)event;
-(IBAction)FingerReleased:(id)sender withEvent:(UIEvent*)event;

.m 文件

    viewDidLoad
    
        BigButton = [UIButton buttonWithType:UIButtonTypeCustom];
        [BigButton setFrame:CGRectMake(0, 0, 300, 480)];
        [self.view addSubview:BigButton];

        FingerPos = CGPointMake(0, 0);
        isFingerDown = false;
        FingerPosLabel = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 300, 50)];
        [self.view addSubview:FingerPosLabel];
        [FingerPosLabel setBackgroundColor:[UIColor colorWithRed:0 green:0 blue:0 alpha:1]];
        [FingerPosLabel setTextColor:[UIColor redColor]];

        [BigButton addTarget:self action:@selector(FingerPressed:withEvent:) forControlEvents:UIControlEventTouchDown];
        [BigButton addTarget:self action:@selector(FingerReleased:withEvent:) forControlEvents:UIControlEventTouchUpInside];
        [BigButton addTarget:self action:@selector(FingerMoved:withEvent:) forControlEvents:UIControlEventTouchDragInside];
    

    -(IBAction)FingerPressed:(id)sender withEvent:(UIEvent *)event
    
        NSSet *touches = [event allTouches];
        UITouch *touch = [touches anyObject];
        CGPoint endingPosition = [touch locationInView:self.view];
        FingerPos = endingPosition;
        isFingerDown = true;
    
    -(IBAction)FingerMoved:(id)sender withEvent:(UIEvent *)event
    
        NSSet *touches = [event allTouches];
        UITouch *touch = [touches anyObject];
        CGPoint endingPosition = [touch locationInView:self.view];
        FingerPos = endingPosition;
    
    -(IBAction)FingerReleased:(id)sender withEvent:(UIEvent *)event
    
        NSSet *touches = [event allTouches];
        UITouch *touch = [touches anyObject];
        CGPoint endingPosition = [touch locationInView:self.view];
        FingerPos = endingPosition;
        isFingerDown = false;
    

我确定按钮 BigButton 上方没有任何按钮或任何类型的视图，尽管在不可见区域上方有一个按钮，虽然很远

【参考方案1】：

问题解决了。屏幕是横向的，按钮不够宽。我倒了宽高（应该是480、300）

【讨论】：

它不会帮助你解决这个问题，但将来你可以通过在模拟器中打开“调试->颜色混合层”来调试丢失的触摸。就在昨天，它帮助我调试了一个与我的按钮重叠并吞下触摸事件的透明视图。