Swift國內(nèi)社區(qū): SwiftMic
本篇文章介紹如何實現(xiàn) iOS 切換 app 預(yù)覽模糊的效果抖单。
最終效果：
blur_demo_snapshot_blur.png
blur_demo_snapshot_normal.png
只需修改 AppDelegate.swift 即可蛀恩。
首先聲明一個變量 mBlurView
private var mBlurView: UIView!
增加 getBlurView() 方法
private func getBlurView() -> UIView {
if nil == mBlurView {
let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.Light)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = UIScreen.mainScreen().bounds
mBlurView = blurEffectView
}
return mBlurView
}
當 app 處于 inactive 狀態(tài)時领迈， 添加 blur view 算吩。
func applicationWillResignActive(application: UIApplication) {
// Add blur view
UIApplication.sharedApplication().keyWindow?.addSubview(getBlurView())
}
當 app 處于 active 狀態(tài)時拓萌， 移除 blur view 岁钓。
func applicationDidBecomeActive(application: UIApplication) {
// Remove blur view
if nil != mBlurView {
mBlurView.removeFromSuperview()
}
}
完整代碼示例： iOSDemoCollection -> BlurDemo
