使 UIAlertView 按钮触发功能 On Press
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【中文标题】使 UIAlertView 按钮触发功能 On Press【英文标题】：Make UIAlertView Button trigger function On Press 【发布时间】：2011-07-29 15:08:13 【问题描述】：目前我正在使用以下代码来呈现 UIAlertView：
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Today's Entry Complete"
message:@"Press OK to submit your data!"
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles: nil];
[alert show];
[alert release];
我如何得到它，以便当按下“确定”时，它会触发一个函数，比如-(void)submitData
【问题讨论】：
【参考方案1】：注意：
重要提示： UIAlertView 在 ios 8 中已弃用。（请注意，UIAlertViewDelegate 也已弃用。）要在 iOS 8 及更高版本中创建和管理警报，请改用 UIAlertController 和 UIAlertControllerStyleAlert 的首选样式。
Please check this out tutorial
"deprecated" means???
Objectvie C
.h 文件
@interface urViewController : UIViewController <UIAlertViewDelegate>
.m 文件
// Create Alert and set the delegate to listen events
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Today's Entry Complete"
message:@"Press OK to submit your data!"
delegate:self
cancelButtonTitle:nil
otherButtonTitles:@"OK", nil];
// Set the tag to alert unique among the other alerts.
// So that you can find out later, which alert we are handling
alert.tag = 100;
[alert show];
//[alert release];
-(void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
// Is this my Alert View?
if (alertView.tag == 100)
//Yes
// You need to compare 'buttonIndex' & 0 to other value(1,2,3) if u have more buttons.
// Then u can check which button was pressed.
if (buttonIndex == 0) // 1st Other Button
[self submitData];
else if (buttonIndex == 1) // 2nd Other Button
else
//No
// Other Alert View
斯威夫特
Swifty 的方式是使用新的 UIAlertController 和闭包：
// Create the alert controller
let alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .Alert)
// Create the actions
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default)
UIAlertAction in
NSLog("OK Pressed")
let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel)
UIAlertAction in
NSLog("Cancel Pressed")
// Add the actions
alertController.addAction(okAction)
alertController.addAction(cancelAction)
// Present the controller
self.presentViewController(alertController, animated: true, completion: nil)
【讨论】：
【参考方案2】：如果您使用多个未在类的接口中声明的 UIAlertView 实例，您还可以在委托方法中设置标签来标识实例，例如：
类文件 myClass.m 顶部的某个位置
#define myAlertViewsTag 0
创建 UIAlertView：
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"My Alert"
message:@"please press ok or cancel"
delegate:self
cancelButtonTitle:@"Cancel"
otherButtonTitles:@"OK", nil];
alert.tag = myAlertViewsTag;
[alert show];
[alert release];
委托方法：
-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
if (alertView.tag == myAlertViewsTag)
if (buttonIndex == 0)
// Do something when cancel pressed
else
// Do something for ok
else
// Do something with responses from other alertViews
【讨论】：
【参考方案3】：在分配alertview的时候需要设置delegate，然后使用其中一种UIAlertViewDelegate方法调用自己的方法，例如：
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Today's Entry Complete"
message:@"Press OK to submit your data!"
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
[self submitData];
【讨论】：
【参考方案4】：在显示之前，您需要为您的UIAlertView 设置delegate。然后在委托回调中做这样的工作：
-(void)alertView:(UIAlertView*)alert didDismissWithButtonIndex:(NSInteger)buttonIndex;
if ([[alert buttonTitleAtIndex] isEqualToString:@"Do it"])
// Code to execute on Do it button selection.
我在 https://github.com/Jayway/CWUIKit 的 CWUIKit 项目对 UIAlertView 有一个补充，它允许你做同样的事情，但有块。 Red 使用相同的操作来创建、显示和处理对此的警报：
[[UIAlertView alertViewWithTitle:@"My Title"
message:@"The Message"
cancelButtonTitle:@"Cancel"
otherTitlesAndAuxiliaryActions:@"Do it",
^(CWAuxiliaryAction*a)
// Code to execute on Do it button selection.
, nil] show];
【讨论】：
【参考方案5】：如果您想使用块，您也可以使用MKAdditions 轻松实现这一点，即使对于多个 UIAlertViews。
只需使用类似于此示例的代码：
[[UIAlertView alertViewWithTitle:@"Test"
message:@"Hello World"
cancelButtonTitle:@"Dismiss"
otherButtonTitles:[NSArray arrayWithObjects:@"First", @"Second", nil]
onDismiss:^(int buttonIndex)
NSLog(@"%d", buttonIndex);
onCancel:^()
NSLog(@"Cancelled");
] show];
您可以在本教程中找到更多信息：http://blog.mugunthkumar.com/coding/ios-code-block-based-uialertview-and-uiactionsheet
【讨论】：
【参考方案6】：再澄清一点，
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
//handles title you've added for cancelButtonTitle
if(buttonIndex == [alertView cancelButtonIndex])
//do stuff
else
//handles titles you've added for otherButtonTitles
if(buttonIndex == 1)
// do something else
else if(buttonIndex == 2)
// do different thing
例子，
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Need your action!"
message:@"Choose an option to continue!" delegate:self cancelButtonTitle:@"Not Need!"
otherButtonTitles:@"Do Something", @"Do Different", nil];
[alert show];
（iOS7截图）
【讨论】：
【参考方案7】：从 iOS8 Apple 提供新的 UIAlertController 类，您可以使用它来代替现在已弃用的 UIAlertView，它也在折旧消息中说明
UIAlertView 已弃用。将 UIAlertController 与首选样式一起使用 的 UIAlertControllerStyleAlert 代替
所以你应该使用这样的东西
目标 C
UIAlertController * alert = [UIAlertController
alertControllerWithTitle:@"Title"
message:@"Message"
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* yesButton = [UIAlertAction
actionWithTitle:@"Yes, please"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
//Handle your yes please button action here
];
UIAlertAction* noButton = [UIAlertAction
actionWithTitle:@"No, thanks"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
//Handle no, thanks button
];
[alert addAction:yesButton];
[alert addAction:noButton];
[self presentViewController:alert animated:YES completion:nil];
斯威夫特
Swifty 的方式是使用新的 UIAlertController 和闭包：
// Create the alert controller
let alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .Alert)
// Create the actions
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default)
UIAlertAction in
NSLog("OK Pressed")
let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel)
UIAlertAction in
NSLog("Cancel Pressed")
// Add the actions
alertController.addAction(okAction)
alertController.addAction(cancelAction)
// Present the controller
self.presentViewController(alertController, animated: true, completion: nil)
【讨论】：
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