如何縮放選定的圖像iPhone SDK？

Question

假設我從圖像選擇器中選擇了圖像，現在我想縮放該圖像並想要在按鈕或任何圖像視圖中設置縮放的圖像。

Answer 1

，當你選擇從選擇器中的圖像，它應該returt UIImage類型。只是將它設置爲圖像的任何UIView的sublass（按鈕是UIView的子類也是如此）：

[yourUIImageView setImage:UIImageFronUIPicker]; 
[yourUIButton setBackgroundImage:UIImageFronUIPicker]; 

等等...

Answer 2

你看看UIImageView的contentMode財產。

typedef enum { 
    UIViewContentModeScaleToFill, 
    UIViewContentModeScaleAspectFit, 
    UIViewContentModeScaleAspectFill, 
    UIViewContentModeRedraw, 
    UIViewContentModeCenter, 
    UIViewContentModeTop, 
    UIViewContentModeBottom, 
    UIViewContentModeLeft, 
    UIViewContentModeRight, 
    UIViewContentModeTopLeft, 
    UIViewContentModeTopRight, 
    UIViewContentModeBottomLeft, 
    UIViewContentModeBottomRight, 
} UIViewContentMode; 

Answer 3

實現您的視圖控制器UIImagePickerControllerDelegate並實施以下

委託方法

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo { 

    [selectedImageBtn setImage:image forState:UIControlStateNormal]; 
    [[imagePicker parentViewController] dismissModalViewControllerAnimated:YES]; 

} 
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { 
    [[imagePicker parentViewController] dismissModalViewControllerAnimated:YES]; 
}