iOS 調用相機 ，相簿擷取圖片 並裁剪為正方形

首先採用UIImagePickerController的協議，

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex

{

   if (buttonIndex == 0) {

        UIImagePickerController *picker = [[UIImagePickerControlleralloc] init];

        picker.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;

        picker.delegate =self;

        picker.allowsEditing =YES;//這兩句保證了圖片可以裁剪為正方形

        picker.allowsImageEditing=YES;///這兩句保證了圖片可以裁剪為正方形

        [selfpresentModalViewController:picker animated:YES];

    }elseif (buttonIndex == 1) {

        UIImagePickerController *picker = [[UIImagePickerControlleralloc] init];

        picker.sourceType =UIImagePickerControllerSourceTypeCamera;

        picker.delegate =self;

        picker.allowsEditing =YES;

        picker.allowsImageEditing=YES;

        [selfpresentModalViewController:picker animated:YES];

    }

}

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

{

    [headpicsetImage:aImage forState:UIControlStateNormal];

    [picker dismissModalViewControllerAnimated:YES];

}