Get Screen Size of iPhone/iPad

Here is a simple line to get the screen size in xCode.

UIScreen *screen = [UIScreen mainScreen];

CGRect fullScreenRect = screen.bounds;

//This will be used to get the width and height

fullScreenRect.size.width, fullScreenRect.size.height

And For Games, where Cocoas is using

CGSize winSize = [CCDirector sharedDirector].winSize;

NSLog(@" %f, %f", winSize.width, winSize.height);


Swift:

var screen: UIScreen = UIScreen.mainScreen()

var fullScreenRect: CGRect = screen.bounds

//This will be used to get the width and height

fullScreenRect.size.width, fullScreenRect.size.height

Define Function in Xcode/Swift with multiple Arguments

Xcode:

Function should be in the format of
  selectorFragmentName:(ParameterType)parameterName

Example:

-(void)registerNewUser:(NSString *)userId andPassword:(NSString *)userPassword;

Swift:

private func registerNewUser(userID: String, password: String)-> Void

How to Hide Keyboard in xCode/swift

Objective C:
Just declare the function as mentioned below:

Declare function for TextHolder in "Did End Exit" event as below: in (.h) file

- (IBAction)editingCompleted:(id)sender;

now define function in (.m) file as below:

- (IBAction)editingCompleted:(id)sender {

    [sender resignFirstResponder]; // Here sender is the TextHolder, which text you can print also as sender.text

}

Always use resignFirstResponder with TextHolder, for which keyboard needs to hide.

Swift:
Declare function for TextHolder for "Did End On Exit"

@IBAction func editingCompleted(sender: UITextField) {

        sender.resignFirstResponder()

 }

How to print String in Xcode/Swift

To Print String in xCode:

I am reading a TextField String from xib. (labelName is the name of Label);

Objective C:

NSString *userId = [[NSString alloc] initWithString:labelName.text];

printf("String is %s", [userId UTF8String]);

[userId release];

Swift:

var userId = labelName.text

print(userId?.utf8)