如何在iphone中的自定义按钮上设置活动指示器

Question

我是iPhone开发的新手.我想设置一个活动指示器,它载在我的自定义按钮上.请指导我.(示例:App store - > Search - > Show 25 more(点击)).

Answer 1

添加UIActivityIndicatorView按钮的子视图:

// Create spinner
UIActivityIndicatorView *myIndicator = [[UIActivityIndicatorView alloc] 
  initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];

// Position the spinner
[myIndicator setCenter:CGPointMake(myButton.frame.size.width / 2, myButton.frame.size.height / 2)];

// Add to button
[myButton addSubview:myIndicator];

// Start the animation
[myIndicator startAnimating];