我是我的应用程序,我需要裁剪和从互联网下载的图像。我使用这种方法下载图像:
- (void) loadImageFromWeb {
NSURL* url = [NSURL URLWithString:self.imageURL];
NSURLRequest* request = [NSURLRequest requestWithURL:url];
[NSURLConnection sendAsynchronousRequest:request
queue:[NSOperationQueue mainQueue]
completionHandler:^(NSURLResponse * response,
NSData * data,
NSError * error) {
if (!error){
UIImage* image = [[UIImage alloc] initWithData:data];
[self.imageViewEpisode setImage:image];
}
}];
}
我如何裁剪它?
最佳答案
定义一个矩形,这个矩形将是你的图像的裁剪区域。
CGRect croprect = CGRectMake(x,y,width, height);
CGImageRef subImage = CGImageCreateWithImageInRect (yourimage,croprect);
这里我们使用 CoreGraphics 从您的图像创建子图像。
Creates a bitmap image using the data contained within a subregion of an existing bitmap image.
CGImageRef CGImageCreateWithImageInRect (
CGImageRef image,
CGRect rect
);
Parameters
image
The image to extract the subimage from.
rect
A rectangle whose coordinates specify the area to create an image from.
Return Value
A CGImage object that specifies a subimage of the image. If the rect parameter defines an area that is not in the image, returns NULL.
最后生成图片,
UIImage *newImage = [UIImage imageWithCGImage:subImage];
关于ios - 在 UIImageView 中显示之前裁剪图像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17784922/