UIButton 禁用高亮

参考：https://www.itranslater.com/qa/details/2129903136516080640

方式一：设置高亮和 Selected 同样（如果有title、image等，也要这样设置，不推荐这个方式）

button.adjustsImageWhenHighlighted = NO;
[button setBackgroundImage:[UIImage imageNamed:@"switch_close"] forState:UIControlStateNormal];
[button setBackgroundImage:[UIImage imageNamed:@"switch_open"] forState:UIControlStateSelected];
[button setBackgroundImage:[UIImage imageNamed:@"switch_open"] forState:UIControlStateSelected | UIControlStateHighlighted];

方式二：UIControlEventAllTouchEvents（推荐）

[button addTarget:self action:@selector(allTouchEventsClick:) forControlEvents:UIControlEventAllTouchEvents];

- (void)allTouchEventsClick:(UIButton *)button{
   button.highlighted = NO;
}

Tip：可以创建一个自己的Button，方便使用

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface TMButton : UIButton

/// 如果外面需要监听UIControlEventAllTouchEvents可以使用 block 代替
@property (copy, nonatomic) void(^allTouchEventsClickBlock)(UIButton *button);

@end

NS_ASSUME_NONNULL_END

#import "TMButton.h"

@implementation TMButton

- (instancetype)init
{
    self = [super init];
    if (self) {
        [self addTarget:self action:@selector(allTouchEventsClick:) forControlEvents:UIControlEventAllTouchEvents];
    }
    return self;
}

- (void)allTouchEventsClick:(UIButton *)button{
    button.highlighted = NO;
    if(self.allTouchEventsClickBlock){
        self.allTouchEventsClickBlock(button);
    }
}

@end