ios UIButton设置高亮状态下的背景色

一，通过按钮的事件来设置背景色

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- ( void )viewDidLoad {
     [ super  viewDidLoad];
     
     UIButton *button1 = [[UIButton alloc] initWithFrame:CGRectMake(50, 200, 100, 50)];
     [button1 setTitle: @"button1"  forState:UIControlStateNormal];
     button1.backgroundColor = [UIColor orangeColor];
     [button1 addTarget: self  action: @selector (button1BackGroundHighlighted:) forControlEvents:UIControlEventTouchDown];
     [button1 addTarget: self  action: @selector (button1BackGroundNormal:) forControlEvents:UIControlEventTouchUpInside];
     [ self .view addSubview:button1];
}
 
//  button1普通状态下的背景色
- ( void )button1BackGroundNormal:(UIButton *)sender
{
     sender.backgroundColor = [UIColor orangeColor];
}
 
//  button1高亮状态下的背景色
- ( void )button1BackGroundHighlighted:(UIButton *)sender
{
     sender.backgroundColor = [UIColor greenColor];
}

二,通过把颜色转换为UIImage来作为按钮不同状态下的背景图片

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- ( void )viewDidLoad {
     [ super  viewDidLoad];
     
     UIButton *button2 = [[UIButton alloc] initWithFrame:CGRectMake(170, 200, 100, 50)];
     [button2 setTitle: @"button2"  forState:UIControlStateNormal];
     [button2 setBackgroundImage:[ self  imageWithColor:[UIColor redColor]] forState:UIControlStateNormal];
     [button2 setBackgroundImage:[ self  imageWithColor:[UIColor grayColor]] forState:UIControlStateHighlighted];
     [ self .view addSubview:button2];
}
 
//  颜色转换为背景图片
- (UIImage *)imageWithColor:(UIColor *)color {
     CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
     UIGraphicsBeginImageContext(rect.size);
     CGContextRef context = UIGraphicsGetCurrentContext();
     
     CGContextSetFillColorWithColor(context, [color CGColor]);
     CGContextFillRect(context, rect);
     
     UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
     UIGraphicsEndImageContext();
     
     return  image;
}

 

三

1.首先，添加一个按钮在界面上，我们先设置好普通和高亮状态时的文字，还有圆角

    UIButton *button  = [[UIButton alloc] initWithFrame:CGRectMake(100, 100, 100, 40)]; [button setTitle:@"normal" forState:UIControlStateNormal]; [button setTitle:@"highlighted" forState:UIControlStateHighlighted]; [button setBackgroundColor:[UIColor redColor]]; button.layer.cornerRadius = 10.0f; button.layer.masksToBounds = YES; [self.view addSubview:button]; // 添加观察者方法 [self addObserver:button];

2.添加观察者

/**
 *  添加观察者
 *
 *  @param button 需要设置的按钮
 */
- (void)addObserver:(UIButton *)button {
    
    [button addObserver:self forKeyPath:@"highlighted" options:NSKeyValueObservingOptionNew context:nil]; }

3.接下来就是实现观察者方法

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context { UIButton *button = (UIButton *)object; if ([keyPath isEqualToString:@"highlighted"]) { if (button.highlighted) { [button setBackgroundColor:[UIColor blueColor]]; return; } [button setBackgroundColor:[UIColor redColor]]; } }

这样我们就能在不使用图片的前提下，实现设置高亮和普通状态下的背景颜色
看下具体的效果

转载于:https://www.cnblogs.com/sunfuyou/p/8521468.html