Question

在我的应用程序中有4个UIButton，它们都连接到4个UIAlerView，因此当按下按钮时，应弹出UIAlertView。这适用于所有UIButton。 UIAlertView中的一个选项应该打开照片库，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中选择任何一张照片时，照片只适用于一张ImageView，第四张。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，您的代码非常冗余。除了标签的值之外，它是完全相同的4倍。使用变量并只编写一次代码！

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，则需要将图像分配到图像选择器控制器回调中的正确图像视图。这是合乎逻辑的，因为您必须知道在分配图像之前拾取了哪个图像。使用

imagePickerController:didFinishPickingMediaWithInfo:

您可以保留变量int lastButtonTag，以便了解上次按下哪个按钮。

iOS - 将代码设置为4个UIImageViews

1 个答案: