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我有一个 UIView，在他上面我有 UIButton、UITableView 和 UINavigationBar。我想要做的是，当您单击 UIButton 并拖动它时，所有视图将仅移动到左侧，直到屏幕结束。我的意思是您可以将视图向左拖动，当您停止触摸时，视图将在您的手指停止触摸屏幕的位置停止。

我做不到，他只给我看“Touches Began 1”，仅此而已。我的问题似乎在这里？

非常感谢大家！

float oldX, oldY;
BOOL dragging;

- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
    NSLog("Touches Began 1");
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.view];

    if (CGRectContainsPoint(btnOpen.frame, touchLocation))
    {
        NSLog("Touches Began 2");
        dragging = YES;
        oldX = touchLocation.x;
        oldY = touchLocation.y;
    }
}

- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.view];

    if (dragging)
    {
        NSLog("Dragging!");
        CGRect frame = mainView.frame;
        frame.origin.x = mainView.frame.origin.x + touchLocation.x - oldX;
        frame.origin.y =  mainView.frame.origin.y + touchLocation.y - oldY;
        mainView.frame = frame;
    }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog("Touches Ended!");
    dragging = NO;
}


- (void)viewDidLoad
{    
    [btnOpen addTarget:self action:@selector(touchesBegan:withEvent:) forControlEvents: UIControlEventTouchDown];
    [btnOpen addTarget:self action:@selector(touchesMoved:withEvent:) forControlEvents: UIControlEventTouchDragInside];
    [btnOpen addTarget:self action:@selector(touchesEnded:withEvent:) forControlEvents: UIControlEventTouchUpInside | UIControlEventTouchUpOutside];
}
4

2 回答 2

3

您正在询问相对于主视图框架的触摸坐标

CGPoint touchLocation = [touch locationInView:self.view];

然后你问 的位置touchLocation是否在按钮框架的框架内

if (CGRectContainsPoint(btnOpen.frame, touchLocation))

换句话说。您正在检查触摸是否在按钮的范围内，但您通过主视图而不是按钮上的触摸坐标进行检查。

所以这是你应该做的：

CGPoint touchLocation = [touch locationInView:btnOpen];
于 2012-08-09T11:40:18.977 回答
2 
- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
    NSLog("Touches Began 1");
for (UITouch *touch in touches) {
    //UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.view];

    if (CGRectContainsPoint(btnOpen.frame, touchLocation))
    {
        NSLog("Touches Began 2");
        //dragging = YES;
        oldX = touchLocation.x;
        oldY = touchLocation.y;
    }
}
}

- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
   // UITouch *touch = [[event allTouches] anyObject];
for (UITouch *touch in touches) {
    CGPoint touchLocation = [touch locationInView:self.view];

    if (CGRectContainsPoint(btnOpen.frame, touchLocation))
    {
        NSLog("Dragging!");
        CGRect frame = mainView.frame;
        frame.origin.x = mainView.frame.origin.x + touchLocation.x - oldX;
        frame.origin.y =  mainView.frame.origin.y + touchLocation.y - oldY;
        mainView.frame = frame;
    }
}
}

试试这样我认为它会对你有所帮助。

于 2012-08-09T12:00:24.963 回答