是否可以更改 UIButtons 的背景颜色？

Question

This one has me stumped.

Is it possible at all to change the background color of a UIButton in Cocoa for iPhone. I've tried setting the background color but it only changes the corners. setBackgroundColor: seems to be the only method available for such things.

[random setBackgroundColor:[UIColor blueColor]];
[random.titleLabel setBackgroundColor:[UIColor blueColor]];

Answer 1

This can be done programmatically by making a replica:

loginButton = [UIButton buttonWithType:UIButtonTypeCustom];
[loginButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
loginButton.backgroundColor = [UIColor whiteColor];
loginButton.layer.borderColor = [UIColor blackColor].CGColor;
loginButton.layer.borderWidth = 0.5f;
loginButton.layer.cornerRadius = 10.0f;

edit: of course, you'd have to #import <QuartzCore/QuartzCore.h>

edit: to all new readers, you should also consider a few options added as "another possibility". for you consideration.

As this is an old answer, I strongly recommend reading comments for troubleshooting

Answer 2

I have a different approach,

[btFind setTitle:NSLocalizedString(@"Find", @"") forState:UIControlStateNormal];    
[btFind setBackgroundImage:[CommonUIUtility imageFromColor:[UIColor cyanColor]] 
        forState:UIControlStateNormal];
btFind.layer.cornerRadius = 8.0;
btFind.layer.masksToBounds = YES;
btFind.layer.borderColor = [UIColor lightGrayColor].CGColor;
btFind.layer.borderWidth = 1;

From CommonUIUtility,

+ (UIImage *) imageFromColor:(UIColor *)color {
    CGRect rect = CGRectMake(0, 0, 1, 1);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    //  [[UIColor colorWithRed:222./255 green:227./255 blue: 229./255 alpha:1] CGColor]) ;
    CGContextFillRect(context, rect);
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}

Don't forget to #import <QuartzCore/QuartzCore.h>

Answer 3

I assume you're talking about a UIButton with UIButtonTypeRoundedRect ? You can't change the background color of that. When you try changing it's background color you're rather changing the color of the rect the button is drawn on (which is usually clear). So there are two ways to go. Either you subclass UIButton and overwrite its -drawRect: method or you create images for the different button states (which is perfectly fine to do).

If you set the background images in Interface Builder you should notice that IB doesn't support setting images for all the states the button can have, so I recommend setting the images in code like this:

UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
[myButton setBackgroundImage:[UIImage imageNamed:@"normal.png"] forState:UIControlStateNormal];
[myButton setBackgroundImage:[UIImage imageNamed:@"disabled.png"] forState:UIControlStateDisabled];
[myButton setBackgroundImage:[UIImage imageNamed:@"selected.png"] forState:UIControlStateSelected];
[myButton setBackgroundImage:[UIImage imageNamed:@"higligted.png"] forState:UIControlStateHighlighted];
[myButton setBackgroundImage:[UIImage imageNamed:@"highlighted+selected.png"] forState:(UIControlStateHighlighted | UIControlStateSelected)];

The last line shows how to set an image for the selected & highlighted state (that's the one IB can't set). You don't need the selected images (line 4 & 6) if you're button dosn't need a selected state.

Answer 4

Another possibility:

1. Create a UIButton in Interface builder.
2. Give it a type 'Custom'
3. Now, in IB it is possible to change the background color

However, the button is square, and that is not what we want. Create an IBOutlet with a reference to this button and add the following to the viewDidLoad method:

[buttonOutlet.layer setCornerRadius:7.0f];
[buttonOutlet.layer setClipToBounds:YES];

Don't forget to import QuartzCore.h

Answer 5

Subclass UIButton and override setHighlighted and setSelected methods

-(void) setHighlighted:(BOOL)highlighted {

  if(highlighted) {
    self.backgroundColor = [self.mainColor darkerShade];
  } else {
    self.backgroundColor = self.mainColor;
  }
  [super setHighlighted:highlighted];
}

-(void) setSelected:(BOOL)selected {

  if(selected) {
    self.backgroundColor = [self.mainColor darkerShade];
  } else {
    self.backgroundColor = self.mainColor;
  }
  [super setSelected:selected];
}

My darkerShade method is in a UIColor category like this

-(UIColor*) darkerShade {

  float red, green, blue, alpha;
  [self getRed:&red green:&green blue:&blue alpha:&alpha];

  double multiplier = 0.8f;
  return [UIColor colorWithRed:red * multiplier green:green * multiplier blue:blue*multiplier alpha:alpha];
}

Answer 6

Another possibility (the best and most beautiful imho):

Create a UISegmentedControl with 2 segments in the required background color in Interface Builder. Set the type to 'bar'. Then, change it to having only one segment. Interface builder does not accept one segment so you have to do that programmatically.

Therefore, create an IBOutlet for this button and add this to the viewDidLoad of your view:

[segmentedButton removeSegmentAtIndex:1 animated:NO];

Now you have a beautiful glossy, colored button with the specified background color. For actions, use the 'value changed' event.

(I have found this on http://chris-software.com/index.php/2009/05/13/creating-a-nice-glass-buttons/ ). Thanks Chris!

Answer 7

If you are not wanting to use images, and want it to look exactly like the Rounded Rect style, try this. Just place a UIView over the UIButton, with an identical frame and auto resize mask, set the alpha to 0.3, and set the background to a color. Then use the snippet below to clip the rounded edges off the colored overlay view. Also, uncheck the 'User Interaction Enabled' checkbox in IB on the UIView to allow touch events to cascade down to the UIButton underneath.

One side effect is that your text will also be colorized.

#import <QuartzCore/QuartzCore.h>

colorizeOverlayView.layer.cornerRadius = 10.0f;
colorizeOverlayView.layer.masksToBounds = YES;

Answer 8

Well I'm 99% percent positive that you cannot just go and change the background color of a UIButton. Instead you have to go and change the background images yourself which I think is a pain. I'm amazed that I had to do this.

If I'm wrong or if theres a better way without having to set background images please let me know

[random setBackgroundImage:[UIImage imageNamed:@"toggleoff.png"] forState:UIControlStateNormal];
    [random setTitleColor:[UIColor darkTextColor] forState:UIControlStateNormal];


[random setBackgroundImage:[UIImage imageNamed:@"toggleon.png"] forState:UIControlStateNormal];
    [random setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

Answer 9

You can also add a CALayer to the button - you can do lots of things with these including a color overlay, this example uses a plain color layer you can also easily graduate the colour. Be aware though added layers obscure those underneath

+(void)makeButtonColored:(UIButton*)button color1:(UIColor*) color
{

    CALayer *layer = button.layer;
    layer.cornerRadius = 8.0f;
    layer.masksToBounds = YES;
    layer.borderWidth = 4.0f;
    layer.opacity = .3;//
    layer.borderColor = [UIColor colorWithWhite:0.4f alpha:0.2f].CGColor;

    CAGradientLayer *colorLayer = [CAGradientLayer layer];
    colorLayer.cornerRadius = 8.0f;
    colorLayer.frame = button.layer.bounds;
    //set gradient colors
    colorLayer.colors = [NSArray arrayWithObjects:
                         (id) color.CGColor,
                         (id) color.CGColor,
                         nil];

    //set gradient locations
    colorLayer.locations = [NSArray arrayWithObjects:
                            [NSNumber numberWithFloat:0.0f],
                            [NSNumber numberWithFloat:1.0f],
                            nil];


    [button.layer addSublayer:colorLayer];

}

Answer 10

Per @EthanB suggestion and @karim making a back filled rectangle, I just created a category for the UIButton to achieve this.

Just drop in the Category code: https://github.com/zmonteca/UIButton-PLColor

Usage:

[button setBackgroundColor:uiTextColor forState:UIControlStateDisabled];

Optional forStates to use:

UIControlStateNormal
UIControlStateHighlighted
UIControlStateDisabled
UIControlStateSelected

Answer 11

For professional and nice looking buttons, you may check this custom button component . You can use it directly in your views and tableviews or modify the source code to make it meet your needs. Hope this helps.

Answer 12

这不像子类化 UIButton 那样优雅，但是如果你只是想要一些快速的东西 - 我所做的是创建自定义按钮，然后是一个 1px x 1px 的图像，它的颜色是我想要的按钮，然后设置背景用于突出显示状态的该图像的按钮 - 适合我的需要。

Answer 13

I know this was asked a long time ago and now there's a new UIButtonTypeSystem. But newer questions are being marked as duplicates of this question so here's my newer answer in the context of an iOS 7 system button, use the .tintColor property.

let button = UIButton(type: .System)
button.setTitle("My Button", forState: .Normal)
button.tintColor = .redColor()

Answer 14

add a second target for the UIButton for UIControlEventTouched and change the UIButton background color. Then change it back in the UIControlEventTouchUpInside target;

Answer 15

[myButton setBackgroundColor:[UIColor blueColor]]; [myButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

可以通过这种方式进行更改，也可以在 Storyboard 中更改右侧选项的背景。

Answer 16

Swift 3:

        static func imageFromColor(color: UIColor, width: CGFloat, height: CGFloat) -> UIImage {
            let rect = CGRect(x: 0, y: 0, width: width, height: height)
            UIGraphicsBeginImageContext(rect.size)
            let context = UIGraphicsGetCurrentContext()!
            context.setFillColor(color.cgColor)
            context.fill(rect)
            let img = UIGraphicsGetImageFromCurrentImageContext()!
            UIGraphicsEndImageContext()
            return img
        }

        let button = UIButton(type: .system)
        let image = imageFromColor(color: .red, width: 
        button.frame.size.width, height: button.frame.size.height)
        button.setBackgroundImage(image, for: .normal)

Answer 17

For iOS 15+ Apple provides a simple button configuration to accomplish this.

Objective-C:

randomButton.configuration = [UIButtonConfiguration filledButtonConfiguration];

Swift:

randomButton.configuration = .filled()