iOS-將代碼設置為4個UIImageViews

Question

在我的應用中，有4個UIButton，它們都連接到4個UIAlerView，因此當按下按鈕時，應該彈出一個UIAlertView。 這適用於所有UIButton。 UIAlertView中的一個選項應打開照片庫，以便用戶可以更改連接到每個UIButton的4個UIImageView的圖片。 問題是，當我從UIButtons中選擇圖片時，該照片僅應用於一個ImageView，而第四個僅應用於。 這是我的UIAlertView代碼：

-(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，您的代碼極其冗余。 它是完全相同的4倍，只是標記的值不同。 使用變量 ，只編寫一次代碼！

其次，您引用的代碼與問題無關。 假設您還為圖像視圖提供了與按鈕/警報相同的標簽，則需要在圖像選擇器控制器callback中將圖像分配給正確的圖像視圖。 這是合乎邏輯的，因為在分配圖像之前必須知道選擇了哪個圖像。 采用

imagePickerController:didFinishPickingMediaWithInfo:

您可以將變量保留為int lastButtonTag以便知道最后按下哪個按鈕。