How can I set the title of a UIButton as left-aligned?

Set the contentHorizontalAlignment:

// Swift 
emailBtn.contentHorizontalAlignment = .left;

// Objective-C
emailBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;

You might also want to adjust the content left inset otherwise the text will touch the left border:

// Swift 3 and up:
emailBtn.contentEdgeInsets = UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 0);

// Objective-C
emailBtn.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);

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You can also use interface builder if you don't want to make the adjustments in code. Here I left align the text and also indent it some:

https://i.stack.imgur.com/BdUIE.png

Don't forget you can also align an image in the button too.:

https://i.stack.imgur.com/zF8Pe.png

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In Swift 3+:

button.contentHorizontalAlignment = .left

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Swift 4+

button.contentHorizontalAlignment = .left
button.contentVerticalAlignment = .top
button.contentEdgeInsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)

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UIButton *btn;
btn.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
btn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;

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Using emailBtn.titleEdgeInsets is better than contentEdgeInsets, in case you don't want to change the whole content position inside the button.

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Here is explained how to do it and why it works so: http://cocoathings.blogspot.com/2013/03/how-to-make-uibutton-text-left-or-right.html

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https://i.stack.imgur.com/qFEYr.png

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There is a small error in the code of @DyingCactus. Here is the correct solution to add an UILabel to an UIButton to align the button text to better control the button 'title':

NSString *myLabelText = @"Hello World";
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];

// position in the parent view and set the size of the button
myButton.frame = CGRectMake(myX, myY, myWidth, myHeight); 

CGRect myButtonRect = myButton.bounds;
UILabel *myLabel = [[UILabel alloc] initWithFrame: myButtonRect];   
myLabel.text = myLabelText;
myLabel.backgroundColor = [UIColor clearColor];
myLabel.textColor = [UIColor redColor]; 
myLabel.font = [UIFont fontWithName:@"Helvetica Neue" size:14.0];   
myLabel.textAlignment = UITextAlignmentLeft;

[myButton addSubview:myLabel];
[myLabel release];

Hope this helps....

Al

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For Swift 2.0:

emailBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignment.Left  

This can help if any one needed.

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In Swift 5.0 and Xcode 10.2

You have two ways to approaches

1) Direct approach

btn.contentHorizontalAlignment = .left

2) SharedClass example (write once and use every ware)

This is your shared class(like this you access all components properties)

import UIKit

class SharedClass: NSObject {

    static let sharedInstance = SharedClass()

    private override init() {

    }
}

//UIButton extension
extension UIButton {
    func btnProperties() {
        contentHorizontalAlignment = .left
    }
}

In your ViewController call like this

button.btnProperties()//This is your button

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Try

button.semanticContentAttribute = UISemanticContentAttributeForceRightToLeft;

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SwiftUI

You should change the alignment property of the .frame modifier applied to the Text. Additionally, set the multiline text alignment to .leading.

Button {
    // handler for tapping on the button
} label: {
    Text("Label")
        .frame(width: 200, alignment: .leading)
        .multilineTextAlignment(.leading)
}

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