giving a text margin / padding to the UiButton on

问题:

I have the following layout, and I'm trying to add a padding to the left and right..

the controls are some disabled Uibutton.

My code for creating a button is this:

        UIButton *buttonTime = [[UIButton alloc] initWithFrame:CGRectMake(90, 10, 50, 20)]; 
        [buttonTime setBackgroundImage:[[UIImage imageNamed:@"bubble.png"] stretchableImageWithLeftCapWidth:9 topCapHeight:13] forState:UIControlStateDisabled];

        [buttonTime setTitle:@"27 feb, 2011 11:10 PM" forState:UIControlStateDisabled];             
        [buttonTime setTitleColor:[UIColor blackColor] forState:UIControlStateDisabled];
        buttonTime.titleLabel.font=[UIFont fontWithName:@"Helvetica" size:8.0]; 
        buttonTime.titleLabel.lineBreakMode= UILineBreakModeWordWrap;
        [buttonTime setEnabled:FALSE];
        [scrollView addSubview:buttonTime];
        [buttonTime release];

回答1:

@property(nonatomic) UIEdgeInsets titleEdgeInsets;

Use this property to resize and reposition the effective drawing rectangle for the button title. You can specify a different value for each of the four insets (top, left, bottom, right). A positive value shrinks, or insets, that edge—moving it closer to the center of the button. A negative value expands, or outsets, that edge. Use the UIEdgeInsetsMake function to construct a value for this property. The default value is UIEdgeInsetsZero.

回答2:

Toro's answer is perfect. You can also set the inset values from Size Inspector inside storyboard or xib.

回答3:

Setting the content insets will prevent the UIButton's title to shrink/truncated, giving the text margin a padding.

回答4:

The challenge with the accepted answer is that setting the titleEdgeInsets is the limitation, as noted in Apple's documentation:

This property is used only for positioning the title during layout. The >button does not use this property to determine intrinsicContentSize and >sizeThatFits(_:).

This means that setting the margins only works if the button is explicitly sized to fit the title label and the margins. If a title is too long or the margins too large, the title text may be clipped. This is OK for a button whose title you know at compile time, but for a variable length button title, can pose a problem.

An alternate approach accommodating variable title length is to leave the titleEdgeInsets as the default value. Once the button's title is set, add explicit width and height constraints that accommodate the button's title label and the additional margins. For example:

let margin: CGFloat = 10.0

let button = UIButton()

button.setTitle("My Button Title", for .normal)

button.widthAnchor.constraint(equalToConstant: button.titleLabel!.intrinsicContentSize.width + margin * 2.0).isActive = true

button.heightAnchor.constraint(equalToConstant: button.titleLabel!.intrinsicContentSize.height + margin * 2.0).isActive = true

Position the button without adding further height or width constraints and it will appear properly regardless of title length.

回答5:

This option is also viable if its not too annoying to use a UIButton subclass

class Button: UIButton {
    override var intrinsicContentSize: CGSize {
        get {
            let baseSize = super.intrinsicContentSize
            return CGSize(width: baseSize.width + titleEdgeInsets.left + titleEdgeInsets.right,
                          height: baseSize.height + titleEdgeInsets.top + titleEdgeInsets.bottom)
        }
    }
}

Then use titleEdgeInsets as desired

 let button = Button()
 ... configure button
 button.titleEdgeInsets = ...

回答6:

this link works like a charm with contentHorizontalAlignment property

回答7:

swift 4 Note use contentEdgeInsets not titleEdgeInsets

btn.contentEdgeInsets =  UIEdgeInsetsMake(8, 8, 8, 8)
btn.titleLabel?.lineBreakMode = .byWordWrapping

That will make the button wrap its text and keep it one line as long as there is a space for it + adding some padding around

回答8:

I found an easy/hacky way to add borders to text buttons (and have left/right margins):

1. Create button with title.

2. Place button in storyboard, align where you want and then add a forced width constraint that is an even number (I used 20, so it adds 10 points on each side). This will force the border around the width you created.

3. Use code to create a border. eg:

   myTextButton.backgroundColor = .clear
   myTextButton.layer.cornerRadius = 5
   myTextButton.layer.borderWidth = 2
   myTextButton.layer.borderColor = UIColor.white.cgColor
   

4. Set left titleInset to 2 via editor (now under Size Inspector) or by code. This seems to center the text, but this value may be different for various texts and text sizes.

This post is for XCode 8.1 and Swift 3.

回答9:

With the above solutions, some of the text were cut out if you have a border around the button. For instance, a button label named "Delete something" ends up showing "Dele...ing". If you are having this problem, this is the solution:

aButton.contentEdgeInsets = UIEdgeInset.init(top: 0, left: 8, bottom: 0, right: 8)