不调用UIButton目标动作

Question

Forgive me if this is trivial, I am still honing my programing skills. I am trying to set this button as a target. Should be easy but I dont know why it's not working! I inserted a NSLog to test and the method is not being called! Thanks for your help.

//ShareView.h

@property (strong,nonatomic) UIButton *cancelBtn;


//ShareView.m
- (id)initWithFrame:(CGRect)frame{
        self = [super initWithFrame:frame];
        if (self) {
            // Initialization code

            UIImage *shareImage = [UIImage imageNamed:@"shareBox.png"];
            [self setFrame:CGRectMake(10, 170, shareImage.size.width, shareImage.size.height)];

            self.shareIV = [[UIImageView alloc] initWithImage:shareImage];
            self.shareIV.userInteractionEnabled = YES;

            [self addSubview:self.shareIV];  

            [self shareBtnsInit];
            [self.shareIV addSubview:self.cancelBtn];

            self.userInteractionEnabled = YES;
        }
        return self;
}


-(void)shareBtnsInit{

        UIImage *cancelImg = [UIImage imageNamed:@"cancel27.png"];
        self.cancelBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        [self.cancelBtn setImage:cancelImg forState:UIControlStateNormal];
        [self.cancelBtn setFrame:CGRectMake(277, 3, cancelImg.size.width, cancelImg.size.height)];

}

//MainViewController.m

-(IBAction)settingsButtonPressed:(id)sender{
    self.shareVC = [[ShareView alloc] initWithFrame:CGRectMake(0, 0, 0,0)];
    [self.view addSubview: self.shareVC];

    [self.shareVC.cancelBtn addTarget:self action:@selector(settingsCancel:) forControlEvents:UIControlEventTouchUpInside];

}

-(IBAction)settingsCancel:(id)sender{
    NSLog(@"TEST!!!");
    [self.shareVC removeFromSuperview];
}

Answer 1

基于注释，没有调用settingsButtonPressed:方法，因此从未设置要查找操作的按钮。

Answer 2

Try adding [self.cancelBtn addTarget:self action:@selector(settingsCancel:) forControlEvents:UIControlEventTouchUpInside]; to your shareBtnsInit method.

Here's more information on making UIButtons programatically: How do I create a basic UIButton programmatically?

Answer 3

[self.cancelBtn addTarget:MainViewController action:@selector(settingsCancel:) forControlEvents:UIControlEventTouchUpInside];

In ShareView you have to import class in which you want your event should get triggered. Here in ShareView you can import MainViewController class and can use it.