Cocoa Touch - UIButtons - 子类化 UIButton

Question

大家好，谁能解释我如何继承 UIButton 并覆盖一些方法，以便当用户拖出按钮时它会立即出现？问题是当我拖出按钮框架时，它仍然处于活动状态并向下移动。我希望它在手指离开按钮框架后立即停止。有什么想法吗？

（可可触摸）

Answer 1

如果有人遇到过这个问题，下面的代码可以在拖动时实现极其准确的边缘感应。如果你拖出按钮，它不会像往常一样超出按钮的边缘。

（我继承了 UIButton 并做了以下：）

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    touchBlocker = TRUE;
    self.highlighted = TRUE;
    NSLog(@"Touch Began");
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:self];
    if (touchBlocker) {
        if (!CGRectContainsPoint([self bounds], location)) {
            touchBlocker =FALSE;
            self.highlighted = FALSE;
            NSLog(@"Touch Exit");
        }   
    } else if (CGRectContainsPoint([self bounds], location)) {
        touchBlocker = TRUE;
        self.highlighted = TRUE;
        NSLog(@"Touch Enter");
    }

}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    touchBlocker = FALSE;
    self.highlighted = FALSE;
    NSLog(@"Touch Ended");
}