UIImageView:作用:专门用于显示图片首先看下官方的解说:An image view object provides a view-based container for displaying either a single image or for animating a ser... 阅读全文
UIActivityIndicatorView:作用:进行提示用户当前正在加载进度,该控件可以消除用户等待的心理事件,增加用户体验。首先来看下官方解说:Use an activity indicator to show that a task is in progress. An acti... 阅读全文