将图片写入相册的方法代码

//保存到相册

UIGraphicsBeginImageContext(self.captureImv.bounds.size);

[self.captureImv.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *temp = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

UIImageWriteToSavedPhotosAlbum(temp, nil, nil, nil);

将图片存储在本地的方法

NSData *imageData = UIImageJPEGRepresentation(self.completeImage, 1);

NSLog(@"截取后图片为:%uldKB",[imageData length]/1000);

//保存到沙盒

[imageData writeToFile:self.imageFilePath atomically:YES];

NSLog(@"图片在这里-->%@",self.imageFilePath);

截取固定区域图片的方法

//截取全屏

UIGraphicsBeginImageContext(CGSizeMake(k_width, k_height));

[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

//截取所需区域

CGRect captureRect = CGRectMake(capture_x,capture_y,capture_width,capture_width);

CGImageRef sourceImageRef = [image CGImage];

CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, captureRect);

UIImage *newImage = [UIImage imageWithCGImage:newImageRef];

self.captureImv.image = newImage;