How to use UIAlertController instead of UIAlertView & UIActionsheet in iOS8

In iOS8 UIAlertController replaces UIActionsheet and UIAlertView. An AlertController can be created with a "title" and a "message".

We can set two styles to an AlertController. Which is given below.
(a)UIAlertControllerStyleActionSheet -  for configuring UIAlertController as an ActionSheet
(b)UIAlertControllerStyleAlert             -  for configuring UIAlertController as an Alert.

How to create an Alert/ActionSheet

• Creating an AlertController object

	UIAlertController *alertView = [UIAlertController alertControllerWithTitle:@"Menu"
	message:@"Select a menu"
	preferredStyle:UIAlertControllerStyleAlert];

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• Adding an Action

	[alertView addAction:[UIAlertAction actionWithTitle:@"ok"
	style:UIAlertActionStyleDefault
	handler:^(UIAlertAction *action) {
	//todo
	}]];

view raw gistfile1.txt hosted with ❤ by GitHub

      
The handler block can be used to get the call back when “ok” button is pressed.

• Presenting the alertController

	[self presentViewController:alertView animated:YES completion:^{
	NSLog(@"alertView shown!");
	}];

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How to create a simple Alert with OK button and a message

The following method will create a simple Alert in iOS8.

	- (void)showSimpleAlert {
	UIAlertController *alertView = [UIAlertController alertControllerWithTitle:@"Alert!"
	message:@"This is an Alert."
	preferredStyle:UIAlertControllerStyleAlert];
	[alertView addAction:[UIAlertAction actionWithTitle:@"ok"
	style:UIAlertActionStyleDefault
	handler:^(UIAlertAction *action) {
	NSLog(@"action - %@", action.title);
	}]];
	[self presentViewController:alertView animated:YES completion:^{
	NSLog(@"alertView shown!");
	}];
	}

view raw gistfile1.txt hosted with ❤ by GitHub

The Alert will be looking like as given below.

How to create a an Alert with two buttons

	- (void)showAlertWithTwoButtons {
	UIAlertController *alertView = [UIAlertController alertControllerWithTitle:@"Alert!"
	message:@"This is an Alert."
	preferredStyle:UIAlertControllerStyleAlert];
	[alertView addAction:[UIAlertAction actionWithTitle:@"ok"
	style:UIAlertActionStyleDefault
	handler:^(UIAlertAction *action) {
	NSLog(@"action - %@", action.title);
	}]];
	[alertView addAction:[UIAlertAction actionWithTitle:@"Cancel"
	style:UIAlertActionStyleDefault
	handler:^(UIAlertAction *action) {
	NSLog(@"action - %@", action.title);
	}]];
	[self presentViewController:alertView animated:YES completion:^{
	NSLog(@"alertView shown!");
	}];
	}

view raw gistfile1.txt hosted with ❤ by GitHub

The Alert will be looking like as given below.

How to create an Alert with a TextField

	- (void)showAlertWithTextField {
	UIAlertController *alertView = [UIAlertController alertControllerWithTitle:@"Menu"
	message:@"Select a menu"
	preferredStyle:UIAlertControllerStyleAlert];
	[alertView addTextFieldWithConfigurationHandler:^(UITextField *textField) {
	//Customize the textField
	textField.placeholder = @"User name";
	textField.textColor = [UIColor whiteColor];
	textField.borderStyle = UITextBorderStyleRoundedRect;
	textField.backgroundColor = [UIColor colorWithRed:171/255 green:182/255 blue:255/255 alpha:0.5];
	}];
	[alertView addAction:[UIAlertAction actionWithTitle:@"ok"
	style:UIAlertActionStyleDefault
	handler:^(UIAlertAction *action) {
	NSLog(@"action - %@", action.title);//callback
	}]];
	[self presentViewController:alertView animated:YES completion:^{
	NSLog(@"completed");
	}];
	}

view raw gistfile1.txt hosted with ❤ by GitHub

The Alert will be looking like as given below.

How to create an Alert with two textfields

	- (void)showAlertWithTwoTextField {
	UIAlertController *alertView = [UIAlertController alertControllerWithTitle:@"Menu"
	message:@"Select a menu"
	preferredStyle:UIAlertControllerStyleAlert];
	[alertView addTextFieldWithConfigurationHandler:^(UITextField *textField) {
	textField.placeholder = @"User name";
	textField.textColor = [UIColor whiteColor];
	textField.borderStyle = UITextBorderStyleRoundedRect;
	textField.backgroundColor = [UIColor colorWithRed:171/255 green:182/255 blue:255/255 alpha:0.5];
	}];
	[alertView addTextFieldWithConfigurationHandler:^(UITextField *textField) {
	textField.placeholder = @"Passcode";
	textField.textColor = [UIColor whiteColor];
	textField.borderStyle = UITextBorderStyleRoundedRect;
	textField.backgroundColor = [UIColor colorWithRed:171/255 green:182/255 blue:255/255 alpha:0.5];
	}];
	[alertView addAction:[UIAlertAction actionWithTitle:@"ok"
	style:UIAlertActionStyleDefault
	handler:^(UIAlertAction *action) {
	NSLog(@"action - %@", action.title);
	}]];
	[self presentViewController:alertView animated:YES completion:^{
	NSLog(@"completed");
	}];
	}

view raw gistfile1.txt hosted with ❤ by GitHub

The Alert will be looking like as given below.

How to create an Actionsheet with two buttons

For creating an ActionSheet use "PreferredStyle" as "UIAlertControllerStyleActionSheet".

	- (void)showActionSheetWithTwoButtons {
	UIAlertController *alertView = [UIAlertController alertControllerWithTitle:@"ActionSheet!"
	message:@"This is an ActionSheet."
	preferredStyle:UIAlertControllerStyleActionSheet];
	[alertView addAction:[UIAlertAction actionWithTitle:@"ok"
	style:UIAlertActionStyleDefault
	handler:^(UIAlertAction *action) {
	NSLog(@"action - %@", action.title);
	}]];
	[alertView addAction:[UIAlertAction actionWithTitle:@"Cancel"
	style:UIAlertActionStyleDefault
	handler:^(UIAlertAction *action) {
	NSLog(@"action - %@", action.title);
	}]];
	[self presentViewController:alertView animated:YES completion:^{
	NSLog(@"alertView shown!");
	}];
	}

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The ActionSheet will be looking like as given below.