添加目標UIButton添加到UIView子類不工作UIViewController

Question

我有一個自定義UIButton作爲子視圖添加到UIView子類。在我的viewController中，我將自定義的uiview作爲子視圖添加到控制器的視圖中。然後我嘗試添加一個目標到uibutton（在viewWillLoad中），但是選擇器從不被調用。

Answer 1

我只需要將layoutSubviews中的所有邏輯移至構造函數。

Answer 2

確保你正在做這樣的事情：

 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]; 

這將創建一個按鈕，單擊時調用buttonTap方法。

Answer 3

這裏是定製視圖和視圖控制器邏輯

//定製視圖

@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 

//視圖控制器片斷

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」 不會被調用

Answer 4

不知道你是否想出了自己，但當你添加T. arget：self到你的firstButton，self是你實際的自定義視圖，而不是視圖控制器。

因此，如果您將您的（pushToRunwayViewController）方法移動到CustomAISView，則所有內容都應按預期工作。

我希望這會有所幫助。 Rog

Answer 5

首先，UIView與UIControl不同。 UIView並不知道如何處理不同的用戶交互，也沒有實現大部分的事件處理方法。

UIControl爲您做到了。其顯着的子類是UIButton。嘗試從UIControl子類獲取事件處理的所有方法。對於更復雜的方法，在UIView子類的子類中，有另一個UIControl，但我不認爲它是一個好主意。

更多一點點高級事件處理和消息傳遞看看這個：

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