添加目标UIButton添加到UIView子类不工作UIViewController

Question

我有一个自定义UIButton作为子视图添加到UIView子类。在我的viewController中，我将自定义的uiview作为子视图添加到控制器的视图中。然后我尝试添加一个目标到uibutton（在viewWillLoad中），但是选择器从不被调用。

Answer 1

我只需要将layoutSubviews中的所有逻辑移至构造函数。

Answer 2

确保你正在做这样的事情：

 UIButton *btn = [UIButton buttonWithType: UIButtonTypeCustom]; 
     btn.frame = CGRectMake(0, 0, 100, 40); 
     [btn setTitle:@"Click Me" forState: UIControlStateNormal]; 
     [btn setBackgroundColor: [UIColor blackColor]]; 
     [btn setTitleColor: [UIColor whiteColor] forState: UIControlStateNormal]; 
     [btn addTarget:self action:@selector(buttonTap:) forControlEvents: UIControlEventTouchUpInside]; 
     [self.view addSubview:btn]; 

这将创建一个按钮，单击时调用buttonTap方法。

Answer 3

这里是定制视图和视图控制器逻辑

//定制视图

@implementation CustomUIASView 

@synthesize firstButton; 
@synthesize secondButton; 
@synthesize thirdButton; 

- (id)initWithFrame:(CGRect)frame { 

if ((self = [super initWithFrame:frame])) { 

    self.alpha   = .85; 
    self.backgroundColor = [UIColor blackColor]; 
} 

    return self; 
} 


- (void)layoutSubviews { 

    UIImage *buttonImageNormal; 
    UIImage *stretchableButtonImageNormal; 
// 
    buttonImageNormal   = [UIImage imageNamed:@"as-bg.png"]; 
    stretchableButtonImageNormal = [buttonImageNormal stretchableImageWithLeftCapWidth:12 topCapHeight:0]; 

    self.firstButton = [UIButton buttonWithType:UIButtonTypeCustom]; 

    self.firstButton.frame   = CGRectMake(10, 10, 300, 50); 
    self.firstButton.backgroundColor = [UIColor clearColor]; 

    [self.firstButton setTitleColor:RGB(16,62,30) forState:UIControlStateNormal]; 
    [self.firstButton setTitle:@"Watch Video" forState:UIControlStateNormal]; 
    [self.firstButton setBackgroundImage:stretchableButtonImageNormal forState:UIControlStateNormal]; 

    self.firstButton.titleLabel.font = [UIFont boldSystemFontOfSize:16.0f]; 

    [self addSubview:self.firstButton]; 

    self.secondButton = [UIButton buttonWithType:UIButtonTypeCustom]; 

    self.secondButton.frame   = CGRectMake(10, (10 + 50 + 5), 300, 50); 
    self.secondButton.backgroundColor = [UIColor clearColor]; 

    [self.secondButton setTitleColor:RGB(16,62,30) forState:UIControlStateNormal]; 
    [self.secondButton setTitle:@"Save to My Favorites" forState:UIControlStateNormal]; 
    [self.secondButton setBackgroundImage:stretchableButtonImageNormal forState:UIControlStateNormal]; 

    self.secondButton.titleLabel.font = [UIFont boldSystemFontOfSize:16.0f]; 

    [self addSubview:self.secondButton]; 

    self.thirdButton = [UIButton buttonWithType:UIButtonTypeCustom]; 

    buttonImageNormal   = [UIImage imageNamed:@"social-button-bg.png"]; 
    stretchableButtonImageNormal = [buttonImageNormal stretchableImageWithLeftCapWidth:12 topCapHeight:0]; 

    self.thirdButton.frame   = CGRectMake(10, (secondButton.frame.origin.y + secondButton.frame.size.height + 5), 300, 50); 
    self.thirdButton.backgroundColor = [UIColor clearColor]; 

    [self.thirdButton setTitleColor:RGB(16,62,30) forState:UIControlStateNormal]; 
    [self.thirdButton setTitle:@"Share with Friends on" forState:UIControlStateNormal]; 
    [self.thirdButton setBackgroundImage:stretchableButtonImageNormal forState:UIControlStateNormal]; 
    [self.thirdButton setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft]; 

    CGRect thirdButtonFrame = thirdButton.titleLabel.frame; 

    self.thirdButton.titleLabel.font = [UIFont boldSystemFontOfSize:16.0f]; 
    self.thirdButton.titleEdgeInsets = UIEdgeInsetsMake(thirdButtonFrame.origin.x, thirdButtonFrame.origin.y + 20, 0, 0); 

    [self addSubview:self.thirdButton]; 

    [super layoutSubviews]; 
} 

- (void)dealloc { 
    [firstButton release]; 
    [secondButton release]; 
    [thirdButton release]; 
    [super dealloc]; 
} 

@end 

//视图控制器片断

self.uiasView = [[CustomUIASView alloc] initWithFrame:CGRectMake(0, (self.view.frame.size.height + 270), kDefaultFrameWidth, 300)]; 

[self.uiasView.firstButton addTarget:self action:@selector(pushToRunwayViewController:) forControlEvents:UIControlEventTouchUpInside]; 

[self.view addSubview:self.uiasView]; 

“pushToRunwayViewController” 不会被调用

Answer 4

不知道你是否想出了自己，但当你添加T. arget：self到你的firstButton，self是你实际的自定义视图，而不是视图控制器。

因此，如果您将您的（pushToRunwayViewController）方法移动到CustomAISView，则所有内容都应按预期工作。

我希望这会有所帮助。 Rog

Answer 5

首先，UIView与UIControl不同。 UIView并不知道如何处理不同的用户交互，也没有实现大部分的事件处理方法。

UIControl为您做到了。其显着的子类是UIButton。尝试从UIControl子类获取事件处理的所有方法。对于更复杂的方法，在UIView子类的子类中，有另一个UIControl，但我不认为它是一个好主意。

更多一点点高级事件处理和消息传递看看这个：

How to add UIViewController as target of UIButton action created in programmatically created UIView?