ios - 向 AlertView 发送参数

Question

我有一个委托(delegate)，它接收一条消息，以删除该项目作为参数的项目。
我想显示一个确认 AlertView，然后，如果用户按是，我想删除它。

所以，我所拥有的是

被调用的委托(delegate)方法:

- (void) deleteRecording:aRecording(Recording*)aRecording {

     NSLog(@"Cancel recording extended view");
     UIAlertView *alert = [[UIAlertView alloc]
                      initWithTitle: NSLocalizedString(@"Cancel recording",nil)
                      message: NSLocalizedString(@"Are you sure you want to cancel the recording?",nil)
                      delegate: self
                      cancelButtonTitle: NSLocalizedString(@"No",nil)
                      otherButtonTitles: NSLocalizedString(@"Yes",nil), nil];
    [alert show];
    [alert release];

}

那就是检查哪个按钮被按下的方法:

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {

    switch (buttonIndex) {
        case 0:
        {
            NSLog(@"Delete was cancelled by the user");
        }
        break;

        case 1:
        {

            NSLog(@"Delete deleted by user");
        }


    }

}

所以，我的问题是，如何将 aRecording 参数从第一种方法发送到第二种方法？

非常感谢

Answer 1

将该变量存储在成员变量中(最简单的解决方案)

如果你只传递一个 int 变量，你可以设置 AlertView 标签
属性(property)。

 myAlertView.tag  = YOUR_INT;

According to the documentation,

Note : The UIAlertView class is intended to be used as-is and does not support subclassing. The view hierarchy for this class is private and must not be modified.

So please use the 3rd method only if you are not intending to submit app to app store. Thanks user soemarko ridwan for the tip.

对于传递复杂对象，子类 UIAlertView，添加一个对象
属性(property)

@interface CustomAlertView : UIAlertView
@property (nonatomic, retain) id object;
@end

@implementation CustomAlertView
@synthesize object;
- (void)dealloc {
    [object release];
    [super dealloc];
}
@end

当你创建 AlertView

 CustomAlertView *alert = [[CustomAlertView alloc]
                  initWithTitle: NSLocalizedString(@"Cancel recording",nil)
                  message: NSLocalizedString(@"Are you sure you want to cancel the recording?",nil)
                  delegate: self
                  cancelButtonTitle: NSLocalizedString(@"No",nil)
                  otherButtonTitles: NSLocalizedString(@"Yes",nil), nil];
[alert setObject:YOUR_OBJECT];
[alert show];
[alert release];

在代表

- (void)alertView:(TDAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
     NSLog(@"%@", [alertView object]);
}