浅谈 iOS 中的 Activity Indicator

Activity Indicator 是iOS开发中必不可少的一个视图。本文就简单地总结一下这个Activity Indicator 的使用方法。

默认 Activity Indicator

以下的函数可以向视图添加一个默认的 Activity Indicator

func showActivityIndicatory(parentView: UIView) {

let activityIndicator = UIActivityIndicatorView()

activityIndicator.frame = CGRectMake(0.0, 0.0, 40.0, 40.0)
activityIndicator.center = parentView.center
activityIndicator.hidesWhenStopped = true
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.WhiteLarge

parentView.addSubview(activityIndicator)
activityIndicator.startAnimating()
}

以下是代码的输出

定制 Activity Indicator

以下是将自定义的 Activity indicator 视图

func showActivityIndicatory(parentView: UIView) {
let container: UIView = UIView()
container.frame = parentView.frame
container.center = parentView.center
container.backgroundColor = UIColorFromHex(0xffffff, alpha: 0.3)

let loadingView: UIView = UIView()
loadingView.frame = CGRectMake(0, 0, 80, 80)
loadingView.center = parentView.center
loadingView.backgroundColor = UIColorFromHex(0x444444, alpha: 0.7)
loadingView.clipsToBounds = true
loadingView.layer.cornerRadius = 10

let activityIndicator = UIActivityIndicatorView()
activityIndicator.frame = CGRectMake(0.0, 0.0, 40.0, 40.0);
activityIndicator.activityIndicatorViewStyle =
UIActivityIndicatorViewStyle.WhiteLarge
activityIndicator.center = CGPointMake(loadingView.frame.size.width / 2,
loadingView.frame.size.height / 2);
loadingView.addSubview(activityIndicator)
container.addSubview(loadingView)
parentView.addSubview(container)
activityIndicator.startAnimating()
}

在这个函数中我加入了一个透明视图作为Activiate indicator 的容器。