截图方法

 1     //截图
 2     //1.创建画板
 3     UIGraphicsBeginImageContext([self getWindow].bounds.size);
 4              
 5     //2、将layer画在画板上
 6     [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
 7 
 8     //从当前画板上得到图片
 9     UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
10 
11     //销毁画板
12     CGImageRef imageRef = image.CGImage;
13 
14     //设置区域范围，再在图片上进行区域截图
15     CGRect imageRect = CGRectMake(0, 0, 1, 1);
16     
17     CGImageRef newimage = CGImageCreateWithImageInRect(imageRef, imageRect);
18     
19     self.imageView.image = [UIImage imageWithCGImage:newimage];
20   
21     NSData *imageData = UIImagePNGRepresentation(image);
22 
23     //保存图片比较卡，应在异步分线程完成
24     UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
25     
26     [self saveFileWith:imageData fileName:@"1" Extent:@"jpg"];

 1 //保存图片
 2 -(void)saveFileWith:(NSData *)data fileName:(NSString *)name Extent:(NSString *)Extent
 3 {
 4     NSString *documentDirectory = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject;
 5     
 6     NSString *path = [documentDirectory stringByAppendingString:[NSString stringWithFormat:@"%@.%@",name,Extent]];
 7     
 8     if ([data writeToFile:path atomically:YES]) {
 9         NSLog(@"保存图片成功path =%@",documentDirectory);
10     }
11 }