GCD定时器+切换rootViewController+过渡效果
class AdvertiseViewController: BaseViewController {
@IBOutlet weak var titleLabel: UILabel!
// 延迟初始化 timer
lazy var timer = DispatchSource.makeTimerSource(flags: [], queue: DispatchQueue.global())
// 倒计时的时间
var seconds = 5
override func viewDidLoad() {
super.viewDidLoad()
myNaviBar.isHidden = true
view.backgroundColor = .systemIndigo
titleLabel.text = "哈哈哈哈"
timeCountDown()
}
func timeCountDown() {
timer.schedule(deadline: .now(), repeating: .seconds(1))
timer.setEventHandler(handler: {
DispatchQueue.main.async { [weak self] in
if self!.seconds <= 0 {
self!.terminer()
}
self!.seconds -= 1
}
})
timer.resume()
}
func terminer() {
timer.cancel()
switchRootController()
}
func switchRootController() {
let window = UIApplication.shared.windows.first!
// 过渡动画：0.5s 淡出
UIView.transition(with: window,
duration: 0.5,
options: .transitionCrossDissolve,
animations: {
let old = UIView.areAnimationsEnabled
UIView.setAnimationsEnabled(false)
window.rootViewController = MainTabBarController()
UIView.setAnimationsEnabled(old)
}, completion: { _ in
// Do Nothing
})
}
}
