iOS-将代码设置为4个UIImageViews

Question

在我的应用中，有4个UIButton，它们都连接到4个UIAlerView，因此当按下按钮时，应该弹出一个UIAlertView。 这适用于所有UIButton。 UIAlertView中的一个选项应打开照片库，以便用户可以更改连接到每个UIButton的4个UIImageView的图片。 问题是，当我从UIButtons中选择图片时，该照片仅应用于一个ImageView，而第四个仅应用于。 这是我的UIAlertView代码：

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSString *title = [alertView buttonTitleAtIndex:buttonIndex];

//UIAlertView´s in the UIButtons setup
if (alertView.tag == 1) { //button1
    if (buttonIndex == alertView.cancelButtonIndex) {
        NSLog(@"Done");
    }
    if (buttonIndex == alertView.firstOtherButtonIndex) {
        NSLog(@"Number");
    }
    if (buttonIndex == alertView.firstOtherButtonIndex+1) {

        imagePickerController = [[UIImagePickerController alloc]init];   //I think its this part which are wrong
        [imagePickerController setDelegate:self];
        [imagePickerController setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
        [self presentViewController:imagePickerController animated:YES completion:nil];

    }
}
if (alertView.tag == 2) { //button2
    if (buttonIndex == alertView.cancelButtonIndex) {
        NSLog(@"Done");
    }
    if (buttonIndex == alertView.firstOtherButtonIndex) {
        NSLog(@"Number");
    }
    if (buttonIndex == alertView.firstOtherButtonIndex+1) {

        imagePickerController = [[UIImagePickerController alloc]init];   //I think its this part which are wrong
        [imagePickerController setDelegate:self];
        [imagePickerController setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
        [self presentViewController:imagePickerController animated:YES completion:nil];

    }
}
 if (alertView.tag == 3)
 {
     if (buttonIndex == alertView.cancelButtonIndex) {
         NSLog(@"Done");
     }
     if (buttonIndex == alertView.firstOtherButtonIndex){
         NSLog(@"Number");
     }
     if (buttonIndex == alertView.firstOtherButtonIndex+1){
         imagePickerController = [[UIImagePickerController alloc]init];   //I think its this part which are wrong
         [imagePickerController setDelegate:self];
         [imagePickerController setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
         [self presentViewController:imagePickerController animated:YES completion:nil];
     }

 }
if (alertView.tag == 4);
{
    if (buttonIndex == alertView.cancelButtonIndex){
        NSLog(@"Done");
    }
    if (buttonIndex == alertView.firstOtherButtonIndex){
        NSLog(@"phone number");
    }
    if (buttonIndex == alertView.firstOtherButtonIndex+1){
        imagePickerController = [[UIImagePickerController alloc]init];
        [imagePickerController setDelegate:self];
        [imagePickerController setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
        [self presentViewController:imagePickerController animated:YES completion:nil];
    }
}

}




@end

Answer 1

首先，您的代码极其冗余。 它是完全相同的4倍，只是标记的值不同。 使用变量 ，只编写一次代码！

其次，您引用的代码与问题无关。 假设您还为图像视图提供了与按钮/警报相同的标签，则需要在图像选择器控制器callback中将图像分配给正确的图像视图。 这是合乎逻辑的，因为在分配图像之前必须知道选择了哪个图像。 采用

imagePickerController:didFinishPickingMediaWithInfo:

您可以将变量保留为int lastButtonTag以便知道最后按下哪个按钮。