iOS 实现截屏效果 OC保存屏幕为图片

//获取当前屏幕，并生成Image图片

-(UIImage *)getImage{    UIGraphicsBeginImageContext(self.frame.size);    [self.layer renderInContext:UIGraphicsGetCurrentContext()];    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return image;}

//将数据保存为图片NSData *data = UIImageJPEGRepresentation([self getImage], 1);[data writeToFile:[NSHomeDirectory() stringByAppendingPathComponent:@"Documents/pic.jpg"] atomically:YES];