iOS 如何把view转成image

- (UIImage*) imageWithUIView:(UIView*) view
{ 
UIGraphicsBeginImageContext(view.bounds.size); 
CGContextRef context = UIGraphicsGetCurrentContext();
[view.layer renderInContext:context];
UIImage* tImage = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 
return tImage;

} 

注意：此方法不是线程安全的。使用时需注意！