Question

我需要观察UIControl的touchInside属性，但是因为它不能通过使用KVO来工作。谁能告诉我，如何解决这个问题？

#define SB_NORMAL_BORDER_COLOR [UIColor colorWithWhite:0.751 alpha:1.000].CGColor
#define SB_TOUCH_BORDER_COLOR [UIColor colorWithRed:0.077 green:0.627 blue:1.000 alpha:1.000].CGColor
#define SB_OBSERVER_KEYPATH @"touchInside"

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.layer.borderWidth=1.0f;
        self.layer.borderColor=SB_NORMAL_BORDER_COLOR;
        self.backgroundColor = [UIColor colorWithRed:0.881 green:0.901 blue:0.810 alpha:1.000];
        self.layer.cornerRadius=self.bounds.size.width/2;

        [self addObserver:self forKeyPath:SB_OBSERVER_KEYPATH options:NSKeyValueObservingOptionNew context:nil];

    }
    return self;
}

此类是UIControl子类。

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{

    NSLog(@"Observer");
    if(![keyPath isEqualToString:SB_OBSERVER_KEYPATH]) return;

    BOOL isTouch=[change[@"new"] boolValue];

    if(isTouch){
        self.layer.borderColor=SB_TOUCH_BORDER_COLOR;
        [self sendActionsForControlEvents:UIControlEventTouchUpInside];
    }else{
        self.layer.borderColor=SB_NORMAL_BORDER_COLOR;
    }
}

Answer 1

您需要添加目标操作

- (void)addTarget:(id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents;

并在那里处理你的代码。

然后用该方法进一步发送动作：

[self sendActionsForControlEvents:UIControlEventValueChanged];

如何观察UIControl的touchInside属性？

1 个答案: