objective-c - UIButton 作为 MKAnnotationView 中的 subview 不起作用

Question

我在注释 View 中添加了一个按钮，它显示正确。点击按钮时，我想调用电话，但是当我点击按钮时，它没有响应(按钮甚至没有突出显示)。按钮似乎没有收到触摸事件，但我不知道为什么。

这是我在 customAnnotationView.m 中的代码

- (id)initWithAnnotation:(id <MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier
{
    NSLog(@"initWithAnnotation start");

    //initialze the view
    self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];
    if (self != nil)
    {
        CGRect frame = self.frame;
        frame.size = CGSizeMake(60.0, 85.0);
        self.frame = frame;
        self.backgroundColor = [UIColor clearColor];
        self.centerOffset = CGPointMake(30.0, 42.0);
    }

    //this has nothing to do with my question
    self.title=[[[NSString alloc] init] autorelease];
    self.description=[[[NSString alloc] init] autorelease];
    self.phoneNumber=[[[NSString alloc] init] autorelease];
    customAnnotation * tempCust = (customAnnotation *)annotation;       
    self.title=annotation.title;
    self.description=tempCust.description;
    self.phoneNumber=tempCust.phoneNumber;

    //here is the question button
    self.userInteractionEnabled=YES;
    self.exclusiveTouch=NO;
    UIButton *button=[UIButton buttonWithType:UIButtonTypeRoundedRect];
    [button setTitle:@"Call" forState:UIControlStateNormal];
    //decide the button's position
    CGRect rect=button.frame;
    rect.origin.x=15;
    rect.origin.y=47;
    rect.size.width=40;
    rect.size.height=20;
    button.frame=rect;
    [self addSubview:button];

    [button becomeFirstResponder];

    [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];



    NSLog(@"initWithAnnotation finished");

    return self;
}

//action method
-(void)buttonClicked:(id)sender{
    NSString *callNumber=[[[NSString alloc] initWithFormat:@"tel://%@",self.phoneNumber] autorelease];
    [[UIApplication sharedApplication]openURL:[NSURL URLWithString:callNumber]];
}

为什么按钮不起作用？

Answer 1

self.rightCalloutAccessoryView = button;

使用上面的代替[self addSubview:button];

希望对你有帮助