iphone缩小uIImage图片

UIImage的缩小

有时候，项目中，要用到上传图片，从图片库里取出的图片有的太大了，而要上传的时候，会很费时间，而且也没必要太大，所以就把图片综缩小一下，再传！

[cpp]
#pragma UIImagePickerDelagate  
 
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo 
{ 
    [self.imagePopoverController dismissPopoverAnimated:YES]; 
    /*
     选取成功后在界面上进行显示
     */ 
    //压缩图片  
    int iWidth = image.size.width; 
    int iHeight = image.size.height; 
    if (iWidth>300) {//300你自定义大小，想要弄多大，就弄多大  
        iWidth = 300; 
        iHeight = image.size.height*iWidth/image.size.width; 
        if (iHeight>300) { 
            iHeight = 300; 
            iWidth = image.size.width*iHeight/image.size.height; 
        } 
    } 
    image = [self scaleToSize:image :CGSizeMake(iWidth, iHeight)];//主要在这里  
     
    NSData* imageData = UIImagePNGRepresentation(image); 
     
    [self saveImage:imageData WithName:@"pic.jpg"];//保存图片  
     
     
} 

#pragma UIImagePickerDelagate

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo
{
    [self.imagePopoverController dismissPopoverAnimated:YES];
    /*
     选取成功后在界面上进行显示
     */
    //压缩图片
    int iWidth = image.size.width;
    int iHeight = image.size.height;
    if (iWidth>300) {//300你自定义大小，想要弄多大，就弄多大
        iWidth = 300;
        iHeight = image.size.height*iWidth/image.size.width;
        if (iHeight>300) {
            iHeight = 300;
            iWidth = image.size.width*iHeight/image.size.height;
        }
    }