ios - UIButton 只检测上半部分的触摸

Question

我正在向一个 UIView 添加 3 个 UIButton，通常只有其中的 1 到 2 个会检测到触摸，即便如此，它也只会检测到按钮的上半部分。有人知道为什么会这样吗？

for (int i = 0; i <= 2; i++) {
        int randIndex = arc4random() % [images count];
      //  UIImage *randImage = [images objectAtIndex:randIndex];
        NSString *number = [numbers objectAtIndex:randIndex];
        [images removeObjectAtIndex:randIndex];
        [numbers removeObjectAtIndex:randIndex];
        UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
      //  [button setImage:randImage forState:UIControlStateNormal];
        [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpOutside];
        button.frame = CGRectMake(0, 8, 108, 40);
        button.tag = [number integerValue];
        for (UIView *sub in [baseone subviews]) {
            CGPoint topRight = CGPointMake(sub.frame.origin.x + sub.frame.size.width, sub.frame.origin.y);
            button.frame = CGRectMake(topRight.x, 8, 108, 40);
        }
        [baseone addSubview:button];
    }

Answer 1

baseone 的宽度可能只够容纳前两个按钮。你看到第三个按钮的触地选择了吗？

另外，你的控制事件是TouchUpOutside，我经常看到TouchUpInside，是故意的吗？

PS 没有解决你的问题，但是这个循环:

for (UIView *sub in [baseone subviews]) {
       CGPoint topRight = CGPointMake(sub.frame.origin.x + sub.frame.size.width,    sub.frame.origin.y);
       button.frame = CGRectMake(topRight.x, 8, 108, 40);
}

可以简化为:

UIView * sub = [[baseone subviews] lastObject]
button.frame = CGRectMake(sub.frame.origin.x+sub.frame.size.width, 8, 108, 40);

因为最后一个 subview 总是决定下一个按钮的框架。