UIButtons can be initialized in a frame:

Swift

let button = UIButton(frame: CGRect(x: x, y: y, width: width, height: height)

Objective C

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(x, y, width, height)];

A specific type of UIButton can be created like this:

Swift

let button = UIButton(type: .Custom) 

Objective C

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

where type is a UIButtonType:

enum UIButtonType : Int {
    case Custom
    case System
    case DetailDisclosure
    case InfoLight
    case InfoDark
    case ContactAdd
    static var RoundedRect: UIButtonType { get }
}

Swift

button.setTitle(titleString, forState: controlState)

Objective C

[button setTitle:(NSString *) forState:(UIControlState)];

To set the default title to "Hello, World!"

Swift

button.setTitle("Hello, World!", forState: .normal)

Objective C

[button setTitle:@"Hello, World!" forControlState:UIControlStateNormal];

//Swift
button.setTitleColor(color, forControlState: controlState)

//Objective-C
[button setTitleColor:(nullable UIColor *) forState:(UIControlState)];

To set the title color to blue

//Swift
button.setTitleColor(.blue, for: .normal)

//Objective-C
[button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal]

Swift

//Align contents to the left of the frame
button.contentHorizontalAlignment = .left

//Align contents to the right of the frame
button.contentHorizontalAlignment = .right

//Align contents to the center of the frame
button.contentHorizontalAlignment = .center

//Make contents fill the frame
button.contentHorizontalAlignment = .fill

Objective C

//Align contents to the left
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;

//Align contents to the right
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight;

//Align contents to the center
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;

//Align contents to fill the frame
button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentFill;

The underlying title label, if one exists, can be fetched using

Swift

var label: UILabel? = button.titleLabel

Objective C

UILabel *label = button.titleLabel;

This can be used to set the font of the title label, for example

Swift

button.titleLabel?.font = UIFont.boldSystemFontOfSize(12)

Objective C

button.titleLabel.font = [UIFont boldSystemFontOfSize:12];

A button can be disabled by

Swift

myButton.isEnabled = false

Objective-C:

myButton.enabled = NO;

The button will become gray:

If you don't want the button appearance to change when disabled set adjustsImageWhenDisabled to false / NO

To add a method to a button, first create an action method:

Objective-C

-(void)someButtonAction:(id)sender {
  // sender is the object that was tapped, in this case its the button.
    NSLog(@"Button is tapped"); 
}

Swift

func someButtonAction() {
    print("Button is tapped")
}

Now to add this action method to your button, you have to write following line of code:

Objective C

[yourButtonInstance addTarget:self action:@selector(someButtonAction) forControlEvents:UIControlEventTouchUpInside];

Swift

yourButtonInstance.addTarget(self, action: #selector(someButtonAction), forControlEvents: .TouchUpInside)

For ControlEvents parameter, all members of ENUM UIControlEvents are valid.

Swift

myButton.titleLabel?.font =  UIFont(name: "YourFontName", size: 20)

Objective C

myButton.titleLabel.font = [UIFont fontWithName:@"YourFontName" size:20];

To add a method to a button, first create an action method:

Objective-C

-(void) someButtonAction{
    NSLog(@"Button is tapped");

}

Swift

func someButtonAction() {
        print("Button is tapped")
    }

Now to add this action method to your button, you have to write following line of code:

Objective C

[yourButtonInstance addTarget:self action:@selector(someButtonAction) forControlEvents:UIControlEventTouchUpInside];

Swift

yourButtonInstance.addTarget(self, action: #selector(someButtonAction), forControlEvents: .touchUpInside)

For ControlEvents, all members of ENUM UIControlEvents are valid.

To get the the exact size of a UIButton's text based on its font, use the function intrinsicContentSize.

Swift

button.intrinsicContentSize.width

Objective-C

button.intrinsicContentSize.width;

Swift

button.setImage(UIImage(named:"test-image"), forState: .normal)

Objective C

[self.button setImage:[UIImage imageNamed:@"test-image"] forState:UIControlStateNormal];

---

Multiple Control States

You can also set an image for multiple UIControlStates, for example to set the same image for the Selected and Highlighted state:

Swift

button.setImage(UIImage(named:"test-image"), forState:[.selected, .highlighted])

Objective C

[self.button setImage:[UIImage imageNamed:@"test-image"] forState:UIControlStateSelected|UIControlStateHighlighted];