添加到视图的子视图的UIButton无法响应

Question

一直在寻找这个答案有一段时间没有运气。 从Google到StackOverflow。 到目前为止，我发现的唯一答案是告诉人们在视图中调用initWithFrame而不是仅调用init。 我用initWithFrame代替了对UIViews中所有对init的调用，但是我没有任何运气。

我没有使用IB。

这是我的整个代码：

@interface UnlockKeyboard : UIView
{
    NSArray *buttons;
    UITextField *passcodeFields;

    UIImage *buttonBackgroundImage;
    UIImage *buttonBackgroundHighlightedImage;
    UIImage *middleButtonBackgroundImage;
    UIImage *middleButtonBackgroundImageHighlighted;
    UIImage *screenBackgroundImage;
    UIImage *keypadViewBackgroundImage;

    UIView *infoView;
    UIView *keypadView;
}
@property(nonatomic, retain)UIImage *buttonBackgroundImage;
@property(nonatomic, retain)UIImage *buttonBackgroundHighlightedImage;
@property(nonatomic, retain)UIImage *screenBackgroundImage;
@property(nonatomic, retain)UIImage* keypadViewBackgroundImage;

@end

@implementation UnlockKeyboard
@synthesize buttonBackgroundImage = _buttonBackgroundImage;
@synthesize buttonBackgroundHighlightedImage = _buttonBackgroundHighlightedImage;
@synthesize screenBackgroundImage = _screenBackgroundImage;
@synthesize keypadViewBackgroundImage = _keypadViewBackgroundImage;
-(id)init
{
    if((self = [super initWithFrame:CGRectMake(0, 0, 320, 480)]))
    {
        _unlockKeyboardBundle = [NSBundle bundleForClass:[self class]];
        buttonBackgroundImage = [UIImage imageWithContentsOfFile:[_unlockKeyboardBundle pathForResource:@"button" ofType:@"png"]];
        middleButtonBackgroundImage = [UIImage imageWithContentsOfFile:[_unlockKeyboardBundle pathForResource:@"middleButton" ofType:@"png"]];
        buttonBackgroundHighlightedImage = [UIImage imageWithContentsOfFile:[_unlockKeyboardBundle pathForResource:@"pushedButton" ofType:@"png"]];
        middleButtonBackgroundImageHighlighted = [UIImage imageWithContentsOfFile:[_unlockKeyboardBundle pathForResource:@"pushedButtonMiddle" ofType:@"png"]];
        keypadView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 200)];
        NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

        NSMutableArray *tempButtons = [NSMutableArray array];
        //self.frame = CGRectMake(320, 480, 0, 0);
        self.backgroundColor = [UIColor lightGrayColor];
        self.opaque = YES;

        UIButton *button1 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button1 setTitle:@"1" forState:UIControlStateNormal];
        button1.frame = CGRectMake(0, 261, 106, 50);

        UIButton *button4 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button4 setTitle:@"4" forState:UIControlStateNormal];
        button4.frame = CGRectMake(0, 311, 106, 50);

        UIButton *button7 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button7 setTitle:@"7" forState:UIControlStateNormal];
        button7.frame = CGRectMake(0, 361, 106, 50);

        UIButton *hint = [UIButton buttonWithType:UIButtonTypeCustom];
        [hint setTitle:NSLocalizedString(@"Hint", @"Hint string") forState:UIControlStateNormal];
        hint.frame = CGRectMake(0, 411, 106, 50);

        UIButton *button2 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button2 setTitle:@"2" forState:UIControlStateNormal];
        button2.frame = CGRectMake(106, 261, 108, 50);

        UIButton *button5 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button5 setTitle:@"5" forState:UIControlStateNormal];
        button5.frame = CGRectMake(106, 311, 108, 50);

        UIButton *button8 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button8 setTitle:@"8" forState:UIControlStateNormal];
        button8.frame = CGRectMake(106, 361, 108, 50);

        UIButton *button0 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button0 setTitle:@"0" forState:UIControlStateNormal];
        button0.frame = CGRectMake(106, 411, 108, 50);

        UIButton *button3 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button3 setTitle:@"3" forState:UIControlStateNormal];
        button3.frame = CGRectMake(214, 261, 106, 50);

        UIButton *button6 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button6 setTitle:@"6" forState:UIControlStateNormal];
        button6.frame = CGRectMake(214, 311, 106, 50);

        UIButton *button9 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button9 setTitle:@"9" forState:UIControlStateNormal];
        button9.frame = CGRectMake(214, 361, 106, 50);

        UIButton *cancelOrDelete = [UIButton buttonWithType:UIButtonTypeCustom];
        [cancelOrDelete setTitle:@"<-" forState:UIControlStateNormal];
        cancelOrDelete.frame = CGRectMake(214, 411, 108, 50);

        [tempButtons addObject:button1];
        [tempButtons addObject:button2];
        [tempButtons addObject:button3];
        [tempButtons addObject:button4];
        [tempButtons addObject:button5];
        [tempButtons addObject:button6];
        [tempButtons addObject:button7];
        [tempButtons addObject:button8];
        [tempButtons addObject:button9];
        [tempButtons addObject:button0];
        [tempButtons addObject:hint];
        [tempButtons addObject:cancelOrDelete];

        for(UIButton *theButton in tempButtons)
        {
            if([theButton.currentTitle isEqualToString:@"2"] || [theButton.currentTitle isEqualToString:@"5"] || [theButton.currentTitle isEqualToString:@"8"] || [theButton.currentTitle isEqualToString:@"0"])
            {
                [theButton setBackgroundImage:middleButtonBackgroundImage forState:UIControlStateNormal];
                [theButton setBackgroundImage:middleButtonBackgroundImageHighlighted forState:UIControlStateHighlighted];
            }else
            {
                [theButton setBackgroundImage:buttonBackgroundImage forState:UIControlStateNormal];
                [theButton setBackgroundImage:middleButtonBackgroundImageHighlighted forState:UIControlStateHighlighted];
            }
            [keypadView addSubview:theButton];
        }
        [self addSubview:keypadView];

        [pool drain];
    }
    return self;
}
-(void)dealloc
{
    [buttons release];
    [passcodeFields release];
    [buttonBackgroundImage release];
    [buttonBackgroundHighlightedImage release];
    [screenBackgroundImage release];
    [infoView release];
    [keypadView release];
    [super dealloc];
}

如您所见，我使用UnlockKeyboard继承了UIView。 UnlockKeyboard应该具有另一个子视图（keypadView），其中将包含所有UIButton。 因此，所有keyboardView都是UnlockKeyboards的子视图，所有这些按钮都应位于keyboardView内。 我可以很好地添加它们，但是当我尝试点击它们时，它们的控制状态不会改变。 是的，就像您看到的那样，在创建UIViews时，我将所有对init的调用替换为initWithFrame。

任何帮助，将不胜感激。

Answer 1

您需要为按钮添加目标，以使它们知道按下按钮时要调用的方法。 看起来像这样

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

其中self是包含method的实例，而method是单击按钮时运行的方法。

希望这对你有用

干杯，

〜约翰

Answer 2

您需要为控件状态设置图像，而不是控件状态的背景图像：

[btn setImage: [UIImage imageNamed: @"image.png"] forState: UIControlStateNormal];

因此，它看起来像：

[theButton setImage:middleButtonBackgroundImage forState:UIControlStateNormal];
            [theButton setBackgroundImage:middleButtonBackgroundImageHighlighted forState:UIControlStateHighlighted];

Answer 3

由于没有为按钮定义目标或操作，因此按钮不知道您想做什么。 如果确实有操作，则可以使用action方法更改发送者的状态（发送者为按钮）。

Answer 4

弄清楚了。 我设置有关keyboardView的按钮框架的方式完全搞砸了。 当我决定将按钮添加到超级视图时，我忘记对按钮做一些框架更改，因此按钮可以正确显示，但就其触摸事件而言，“但坐标不正确”。 例如，实际按钮位于（3,4）中，但接触点位于（10,20）中。

修复框架以使Superview更好地播放，从而解决了我的问题