UIButton并非总是会触发

Question

我正在扩展UITableViewController并以编程方式将uibutton添加到表页脚中，由于某种原因，uibutton仅在触摸顶部时才触发...好像某物掩盖了其余部分，我不明白它是什么我在viewForFooterInSection函数上有以下代码：

CGRect screenRect = [[UIScreen mainScreen] applicationFrame];

UIView* footerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, screenRect.size.width, 44.0)];
footerView.autoresizesSubviews = YES;
footerView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
footerView.userInteractionEnabled = YES;


goButton = [UIButton buttonWithType:UIButtonTypeCustom];
[goButton addTarget:self action:@selector(getReport)forControlEvents:UIControlEventTouchUpInside];
[goButton setTitle:@"GO!" forState:UIControlStateNormal];
[goButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
goButton.frame = CGRectMake(50, 20, 220.0, 50.0);

UIImage *bg = [UIImage imageNamed: @"but_go.png"];
[goButton setBackgroundImage:bg forState:UIControlStateNormal];
[goButton setBackgroundColor:[UIColor clearColor]];

if (self.optimizations == nil || self.optimizations.count < 1){
 goButton.enabled = NO ;
}

[footerView addSubview: goButton];

return footerView;

Answer 1

这是因为按钮的框架脱离了其父视图。 您需要增加footerView的框架大小，以便按钮的整个部分都包含在footerView 。 您可以尝试将footerView背景颜色设置为蓝色或红色，以查看实际的框架区域。