【Swift 3.1】iOS开发笔记(四)

2018-01-13 10:58:37来源:http://www.cnblogs.com/over140/p/6836240.html作者:农民伯伯人点击

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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 = 0
animation.toValue = CGFloat.pi * 2
animation.duration = 5
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)* 180 / 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 ?? 0)
return Int64(self.timeIntervalSince1970 * 1000000000) + 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


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