问题
Currently I am using the following code to present a 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];
How do I get it so that when 'OK" is pressed, it triggers a function, say -(void)submitData
回答1:
NOTE:
Important: UIAlertView is deprecated in iOS 8. (Note that UIAlertViewDelegate is also deprecated.) To create and manage alerts in iOS 8 and later, instead use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert.
Please check this out tutorial
"deprecated" means???
Objectvie C
.h file
@interface urViewController : UIViewController <UIAlertViewDelegate> {
.m file
// 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
}
}
Swift
The Swifty way is to use the new UIAlertController and closures:
// 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)
回答2:
If you are using multiple UIAlertView instances that are not declared in the class's interface you can also set a tag to identify instances in your delegate method, for example:
somewhere on top of your class file myClass.m
#define myAlertViewsTag 0
creating the 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];
the delegate method:
-(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
}
}
回答3:
You need to set the delegate when allocating the alertview, then use one of the UIAlertViewDelegate methods to call your own method, for example:
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];
}
回答4:
You need to setup the delegate for your UIAlertView, before showing it. Then do the work in the delegate callback as such:
-(void)alertView:(UIAlertView*)alert didDismissWithButtonIndex:(NSInteger)buttonIndex;
{
if ([[alert buttonTitleAtIndex] isEqualToString:@"Do it"]) {
// Code to execute on Do it button selection.
}
}
My CWUIKit project over at https://github.com/Jayway/CWUIKit has an addition to UIAlertView that allow you to do the same thing but with blocks. Redusing the same operation for both creating, showing and handling the alert to this:
[[UIAlertView alertViewWithTitle:@"My Title"
message:@"The Message"
cancelButtonTitle:@"Cancel"
otherTitlesAndAuxiliaryActions:@"Do it",
^(CWAuxiliaryAction*a) {
// Code to execute on Do it button selection.
}, nil] show];
回答5:
If you want to use blocks you can also use MKAdditions to achieve this easily even for multiple UIAlertViews.
Just use a code similar to this sample:
[[UIAlertView alertViewWithTitle:@"Test"
message:@"Hello World"
cancelButtonTitle:@"Dismiss"
otherButtonTitles:[NSArray arrayWithObjects:@"First", @"Second", nil]
onDismiss:^(int buttonIndex)
{
NSLog(@"%d", buttonIndex);
}
onCancel:^()
{
NSLog(@"Cancelled");
}
] show];
You can find more information in this tutorial: http://blog.mugunthkumar.com/coding/ios-code-block-based-uialertview-and-uiactionsheet
回答6:
Little more clarification,
- (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
}
}
}
Example,
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];
(it's iOS7 screenshot)
回答7:
From iOS8 Apple provide new UIAlertController class which you can use instead of UIAlertView which is now deprecated, its is also stated in depreciation message
UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead
So you should use something like this
Objective 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];
Swift
The Swifty way is to use the new UIAlertController and closures:
// 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)
来源：https://stackoverflow.com/questions/6875183/make-uialertview-button-trigger-function-on-press