iOS捕捉屏幕截图详解手机开发

+ (UIImage *) imageFromView: (UIView *) theView 
{ 
    // Draw a view’s contents into an image context 
    UIGraphicsBeginImageContext(theView.frame.size); 
    CGContextRef context = UIGraphicsGetCurrentContext(); 
    [theView.layer renderInContext:context]; 
    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext(); 
    return theImage; 
}