Button的Disable状态不显示

问题： 一个按钮设置了3种状态，normal, selected, disable 状态， 我先设置了button的选中，又设置了button的不选中，又设置了button的选中，最后设置了button的禁用状态，最后的禁用状态没有显示，显示的UI仍然是normal状态的，不能正常显示disable的样式。

解决方法： 要让选中状态与禁用状态合并到一起

OC版本

UIControlState是位移枚举，OC可以使用”|“和”&“，这两个是C语言的运算符

@interface ViewController ()
//记录次数测试不同状态
@property (nonatomic, assign) NSInteger clickCount;
@end

- (void)viewDidLoad {
    [super viewDidLoad];
//设置一个测试的button
UIButton *btnRZ = [[UIButton alloc] init];
    btnRZ.selected = true;
    [btnRZ setTitle:@"正常" forState:UIControlStateNormal];
    [btnRZ setTitle:@"选中" forState:UIControlStateSelected];
// 注意这里禁用 |  选中
    [btnRZ setTitle:@"禁止" forState:UIControlStateDisabled | UIControlStateSelected];
    [btnRZ setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
    [btnRZ setTitleColor:[UIColor yellowColor] forState:UIControlStateSelected];
// 注意这里禁用 |  选中
    [btnRZ setTitleColor:[UIColor redColor] forState:UIControlStateDisabled | UIControlStateSelected];
    [btnRZ addTarget:self action:@selector(onClickBtnRZ:) forControlEvents:UIControlEventTouchUpInside];
    btnRZ.backgroundColor = [UIColor blackColor];
    [self.view addSubview: btnRZ];
    btnRZ.frame = CGRectMake(45, 200, 300, 50);
}
// button 调用的方法
- (void)onClickBtnRZ:(UIButton *)sender {
    _clickCount += 1;
    if (_clickCount % 3 == 1) {
        sender.selected = NO;
    } else if (_clickCount % 3 == 2) {
        sender.selected = YES;
    } else if (_clickCount % 3  == 0) {
        sender.enabled = NO;
    }
}

Swift版本

Swift不能和C语言混编，所以在swift中已经没有”|“和”&“这样的运算了 ，需要使用的是OptionSet协议

var clickCount = 0

override func viewDidLoad() {
        super.viewDidLoad()
        
        let btnRZ = UIButton()
        btnRZ.isSelected = true
        btnRZ.setTitle("正常", for: .normal)
        btnRZ.setTitle("选中", for: .selected)
// 注意这里[禁用 ，  选中]
        btnRZ.setTitle("禁止", for: [.disabled, .selected])
        btnRZ.setTitleColor(UIColor.green, for: .normal)
        btnRZ.setTitleColor(UIColor.yellow, for: .selected)
// 注意这里[禁用 ,  选中]
        btnRZ.setTitleColor(UIColor.red, for: [.disabled, .selected])
        btnRZ.addTarget(self, action: #selector(onClickBtnRZ(sender:)), for: .touchUpInside)
        btnRZ.backgroundColor = UIColor.black
        self.view.addSubview(btnRZ)
        btnRZ.frame = CGRect.init(x: 45, y: 200, width: 300, height: 50)
}

    @objc func onClickBtnRZ(sender: UIButton){
        clickCount += 1
        if clickCount % 3 == 1 {
            sender.isSelected = false
        } else if clickCount % 3 == 2 {
            sender.isSelected = true
        } else if clickCount % 3  == 0 {
            sender.isEnabled = false
        }
    }

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