一、唱片旋转效果(360°无限顺时针旋转)
func animationRotateCover() {
coverImageView.layer.removeAllAnimations() let animation = CABasicAnimation(keyPath: "transform.rotation")
animation.fromValue =
animation.toValue = CGFloat.pi *
animation.duration =
animation.isCumulative = true
animation.repeatCount = Float.infinity
coverImageView.layer.add(animation, forKey: nil)
}
二、防止文件被 iCloud 同步备份
NSURLIsExcludedFromBackupKey
三、禁止 UICollectionView reload/insert 动画
UIView.performWithoutAnimation {
self.videoPartCollectionView.reloadData()
}
四、Objective-C 中的 performSelector 在 Swift 里变成了 sendAction
var rightTappedSelector: Selector? @IBAction func rightTappedAction(_ sender: Any) {
guard let selector = rightTappedSelector else {
return
}
rightButton.sendAction(selector, to: nil, for: nil)
}
五、获得 CGAffineTransform 的 rotation 信息
extension CGAffineTransform { func getTransformRotation() -> CGFloat {
return atan2(self.b, self.a) * / CGFloat.pi
} }
六、获取 Date 的 nano 时间
extension Date { func nanosecond() -> Int64 {
let nanosecond: Int64 = Int64(Calendar.current.dateComponents([.nanosecond], from: self).nanosecond ?? )
return Int64(self.timeIntervalSince1970 * ) + nanosecond
} }
七、AVCapturePhotoOutput.capturePhoto 崩溃的问题
不要让 UIViewController 实现 AVCapturePhotoCaptureDelegate ,要跟 AVCam 例子一样弄一个 class PhotoCaptureDelegate: NSObject, AVCapturePhotoCaptureDelegate 就不崩溃了,什么鬼问题