如何在 iOS 中调整图像大小？
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How to resize an image in iOS?
提问by iDia
hi I want to send an image to a web service. But I want to resize user selected any image into 75 x 75 and send it to web service. How can I resize this image into 75 x 75
嗨，我想将图像发送到网络服务。但我想将用户选择的任何图像调整为 75 x 75 并将其发送到网络服务。如何将此图像的大小调整为 75 x 75
Thanks
谢谢
回答by Nitin Gohel
Try to implement the code below. It may be helpful for you:
尝试实现下面的代码。它可能对您有帮助：
CGRect rect = CGRectMake(0,0,75,75);
UIGraphicsBeginImageContext( rect.size );
[yourCurrentOriginalImage drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
回答by manujmv
Use this method to resize your image:
使用此方法调整图像大小：
+(UIImage *)imageResize :(UIImage*)img andResizeTo:(CGSize)newSize
{
CGFloat scale = [[UIScreen mainScreen]scale];
/*You can remove the below comment if you dont want to scale the image in retina device .Dont forget to comment UIGraphicsBeginImageContextWithOptions*/
//UIGraphicsBeginImageContext(newSize);
UIGraphicsBeginImageContextWithOptions(newSize, NO, scale);
[img drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
回答by kirti Chavda
try this code:
试试这个代码：
- (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize
{
UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
