Creating UIAlertView and UIActionSheet Programmatically

For Beginner's, you may get a doubts like  this

1.what is the difference between UIAlertView and UIActionSheet?

2. In which scenarios we will use these controls?

Now i am going to clarify your doubts

UIAlertView

•  Alerts give users important information that affects their use of the application (or the device). Alerts are usually unexpected, because they generally tell users about a problem or a change in the current situation that might require users to take action.

EXAMPLE:

      Giving alert when your Mobile Battery is low,

      we can  also design Login form using alert View

Creating AlertView programmatically

UIAlertView *alert = [[UIAlertView alloc]
   initWithTitle: @"AlertView"
   message: @"Welcome To IOS Controls!"
   delegate: nil
   cancelButtonTitle:@"OK"
   otherButtonTitles:nil];
[alert show];

The above code  pop an alert with a title, message and OK 

button like this

NOTE:

If you want  to know  the properties and methods that are present in the Class Or Control, put the cursor on the Class and command+click.You will get that class properties and Methods.

But  if you want to have more than one button on the alert 

and collect user input from it? . To do that, you first need to 

create a class that employs the UIAlertViewDelegate delegate 

like this:

@interface PresentAlert : NSObject <UIAlertViewDelegate>

Then, in PresentAlert.m file, viewDidLoad Method create 

alertView  like this

UIAlertView *alertView = [[UIAlertView alloc]
   initWithTitle: @"AlertView"
   message: @"Welcome To IOS Controls!"
   delegate: self
   cancelButtonTitle:@"Cancel"
   otherButtonTitles:@"Submit",nil];
[alert show];

 you need to override the  alertView  method in order to 

receive input like this:

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
 if (buttonIndex == 0) {
  NSLog(@"Cancel Pressed");
 }
 else  if (buttonIndex==1){
  NSLog(@"Submit Pressed");
 }
}

 Different styles of alertView's are

a.alertView.alertViewStyle = UIAlertViewStyleSecureTextInput.

It pop an alert with textfield,the entered text will be in secure format

b. alertView.alertViewStyle = UIAlertViewStylePlainTextInput.

It pop an alert with textfield,the entered text will be plain format.

c.alertView.alertViewStyle= UIAlertViewStyleLoginAndPasswordInput.

It pop an alert with two textfield's one for user name and another one for pasword.

---------------------------------------------------------------------------------

UIActionSheet

• Action sheets give users additional choices related to the action they are currently taking. 

EXAMPLE:

   If you want to delete the recent call list from your mobile,

action sheet will give options like

           -->Delete Dialed Calls.

           -->Delete Received Calls.

           -->Delete Missed Calls.

           -->Cancel 

Creating UIActionSheet Programmatically

Handling Touch Events For UIButton in IOS

I recently used this code for handling touch events like touchesBegan,touchesMoved,touchesEnded  on UIButton in my project.

STEP 1:Create  UIButton Programmatically like this

1.UIButton *touchButton=[UIButton buttonWithType:UIButtonTypeRoundedRect];

2.    touchButton.frame=CGRectMake(30, 30, 260, 50);

    [touchButton setTitle:@"TOUCH BUTTON" forState:UIControlStateNormal];

 3.   [touchButton addTarget:self action:@selector(touchBegan:withEvent:) forControlEvents: UIControlEventTouchDown];

 4.   [touchButton addTarget:self action:@selector(touchMoving:withEvent:) forControlEvents: UIControlEventTouchDragInside | UIControlEventTouchDragOutside];

  5.  [touchButton addTarget:self action:@selector(touchEnded:withEvent:) forControlEvents: UIControlEventTouchUpInside | UIControlEventTouchUpOutside];

6. [self.view addSubview:touchButton];

In the above code  adding selectors for different control events is important.

if you want to recognize touchBegan Method on UIButton,you have to write the selector method like this 

[touchButton addTarget:self action:@selector(touchBegan:withEvent:) forControlEvents: UIControlEventTouchDown];

if you want to recognize touchMoving Method on UIButton,you have to write the selector method like this 

[touchButton addTarget:self action:@selector(touchMoving:withEvent:) forControlEvents: UIControlEventTouchDragInside | UIControlEventTouchDragOutside];

if you want to recognize touchEnded Method on UIButton,you have to write the selector method like this 

[touchButton addTarget:self action:@selector(touchEnded:withEvent:) forControlEvents: UIControlEventTouchUpInside | UIControlEventTouchUpOutside];

STEP 2: Implement The Selector Methods For Touch Events Like this.

// this method calls whenever you touchDown on button

- (void)touchBegan:(UIButton *)control withEvent:event {

    NSLog(@"touchBegan called......");

    UITouch *touch = [[event allTouches] anyObject];

    CGPoint touchPoint = [touch locationInView:self.view];

    NSLog(@"In Touch Began: Touch x : %f y : %f", touchPoint.x, touchPoint.y);

    

}

// this method calls whenever you touchDragInside or touchDragOutside on button

- (void)touchMoving:(UIButton *)control withEvent:event {

    NSLog(@"touchMoving called......");

    UITouch *touch = [[event allTouches] anyObject];

    CGPoint touchPoint = [touch locationInView:self.view];

     NSLog(@"In Touch Moving  :Touch x : %f y : %f", touchPoint.x, touchPoint.y);

   }

// this method calls whenever you touchUp inside or touchUp outside on button

- (void)touchEnded:(UIButton *)addOnButton withEvent:event {

    NSLog(@"touchEnded called......");

    UITouch *touch = [[event allTouches] anyObject];

    CGPoint touchPoint = [touch locationInView:self.view];

    NSLog(@" In Touch Ended : touchpoint.x and y is %f,%f",touchPoint.x,touchPoint.y);

}

Thank You.....