截取视图的图片, 然后分享出去

OS 7 has a new method that allows you to draw a view hierarchy into the current graphics context. This can be used to get an UIImage very fast.

I implemented a category method on UIView to get the view as an UIImage:

- (UIImage *)pb_takeSnapshot { UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, [UIScreen mainScreen].scale); [self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES]; // old style [self.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image;}

It is considerably faster then the existing renderInContext: method.

Reference : ​​FOR SWIFT: An extension that does the same:

extension UIView { func pb_takeSnapshot() -> UIImage { UIGraphicsBeginImageContextWithOptions(self.bounds.size, false, UIScreen.mainScreen().scale); self.drawViewHierarchyInRect(self.bounds, afterScreenUpdates: true) // old style: self.layer.renderInContext(UIGraphicsGetCurrentContext()) let image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image; }}

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