Question

我创建了一个UIButton;实际上，有几个按钮，我已经初始化它们并在

中设置它们

-(void)viewDidLoad

方法。我现在的问题是将它们连接到我创建的方法。我已经创建了一个typedef枚举来替换我的按钮的标签的数字与某些情况下的名称。我不知道这是问题还是什么，但我很困惑为什么当我按下按钮时，它们不起作用。我的代码如下。

我的枚举：

typedef enum {
DiseasesStrepThroat = 1,
DiseasesFlu         = 2,
DiseasesChickenPox  = 3,
DiseasesSmallPox    = 4,
DiseasesMeasels     = 5,
DiseasesCommonCold  = 6
} DiseasesTagNumber;

我初始化了所有UIButton对象;以及我在我的.h文件中的IBAction，所以我不必担心那部分。

这是我的观点加载

 // Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];    
scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 700, 768, 125)];
scrollView.contentSize = CGSizeMake(1000, 125);
scrollView.backgroundColor = [UIColor darkGrayColor];
scrollView.showsHorizontalScrollIndicator = YES;
scrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scrollView.autoresizesSubviews = NO;
[self.view addSubview:scrollView];

//////////////////////////////////////////
//                                      //
//      creating all the buttons        //
//                                      //
//////////////////////////////////////////

// strep throat
strep = [UIButton buttonWithType:UIButtonTypeRoundedRect];
strep.frame = CGRectMake(10, 10, 110, 100);
[strep setTitle:@"Strep" forState:UIControlStateNormal];
[strep setTag:DiseasesStrepThroat];
[scrollView addSubview:strep];

// the flu
flu = [UIButton buttonWithType:UIButtonTypeRoundedRect];
flu.frame = CGRectMake(130, 10, 110, 100);
[flu setTitle:@"Flu" forState:UIControlStateNormal];
[flu setTag:DiseasesFlu];
[scrollView addSubview:flu];

// chicken pox
chickenPox = [UIButton buttonWithType:UIButtonTypeRoundedRect];
chickenPox.frame = CGRectMake(250, 10, 110, 100);
[chickenPox setTitle:@"Chicken Pox" forState:UIControlStateNormal];
[chickenPox setTag:DiseasesChickenPox];
[scrollView addSubview:chickenPox];

// small pox
smallPox = [UIButton buttonWithType:UIButtonTypeRoundedRect];
smallPox.frame = CGRectMake(370, 10, 110, 100);
[smallPox setTitle:@"Small Pox" forState:UIControlStateNormal];
[smallPox setTag:DiseasesSmallPox];
[scrollView addSubview:smallPox];

// measels
measels = [UIButton buttonWithType:UIButtonTypeRoundedRect];
measels.frame = CGRectMake(490, 10, 110, 100);
[measels setTitle:@"Measels" forState:UIControlStateNormal];
[measels setTag:DiseasesMeasels];
[scrollView addSubview:measels];

// common cold
commonCold = [UIButton buttonWithType:UIButtonTypeRoundedRect];
commonCold.frame = CGRectMake(610, 10, 110, 100);
[commonCold setTitle:@"Common Cold" forState:UIControlStateNormal];
[commonCold setTag:DiseasesCommonCold];
[scrollView addSubview:commonCold];

NSArray *array = [[NSArray alloc] initWithObjects:strep, flu, chickenPox, smallPox, measels, commonCold, nil];
for(UIButton *b in array) {
    b.showsTouchWhenHighlighted = YES;
}


//&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&//
//                                      //
//      CREATING ALL THE TARGETS        //
//                                      //
//&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&//

[strep      addTarget:self action:@selector(showDiseasesWithTag:) forControlEvents:UIControlEventTouchUpInside];
[flu        addTarget:self action:@selector(showDiseasesWithTag:) forControlEvents:UIControlEventTouchUpInside];
[chickenPox addTarget:self action:@selector(showDiseasesWithTag:) forControlEvents:UIControlEventTouchUpInside];
[smallPox   addTarget:self action:@selector(showDiseasesWithTag:) forControlEvents:UIControlEventTouchUpInside];
[measels    addTarget:self action:@selector(showDiseasesWithTag:) forControlEvents:UIControlEventTouchUpInside];
[commonCold addTarget:self action:@selector(showDiseasesWithTag:) forControlEvents:UIControlEventTouchUpInside];

}

现在我的IBAction方法

- (IBAction) showDiseasesWithTag:(NSInteger)senderTag {

switch (senderTag) {
    case DiseasesStrepThroat:

        a = [[UIAlertView alloc] 
                          initWithTitle:@"H" 
                          message:@"yo" 
                          delegate:self 
                          cancelButtonTitle:nil 
                          otherButtonTitles:nil];
        [a show];
        break;

    case DiseasesFlu:
        [UIView animateWithDuration:1.0 animations:^ {

        }completion:^(BOOL finished) {

        }];
        break;

    case DiseasesChickenPox:
        [UIView animateWithDuration:1.0 animations:^ {

        }completion:^(BOOL finished) {

        }];
        break;

    case DiseasesSmallPox:
        [UIView animateWithDuration:1.0 animations:^ {

        }completion:^(BOOL finished) {

        }];
        break;

    case DiseasesMeasels:
        [UIView animateWithDuration:1.0 animations:^ {

        }completion:^(BOOL finished) {

        }];
        break;

    case DiseasesCommonCold:
        [UIView animateWithDuration:1.0 animations:^ {

        }completion:^(BOOL finished) {

        }];
        break;

}
}

要清除任何内容，所有UIView动画和完成块都没有完成。我主要关注第一个案例。是因为我的第一个案例是1吗？当我将它设置为0时，它仍然没有做任何事情。

一切的实际问题是，当我在我的UIScrollView中按下第一个UIButton时，我能够按下它，但是发生的事情是该按钮对IBAction方法没有任何作用。它似乎根本没有调用它。

感谢任何帮助。

Answer 1

好的，你只是对action方法使用了错误的参数。它应该是：

- (IBAction) showDiseasesWithTag:(id)sender {
    NSInteger senderTag = [sender tag];

    switch (senderTag) {
        ...
    }
}

在iOS下，目标方法可以有三种不同的签名之一：

- (IBAction)actionMethod;
- (IBAction)actionMethod:(id)sender;
- (IBAction)actionMethod:(id)sender forEvent:(UIEvent *)event;

但从不：

- (IBAction)actionMethod:(NSInteger)senderTag;

为什么我的按钮不工作？

1 个答案: