Question

我在其他帖子中搜索过但我找不到解决方案。

我有一个无法点击的UIButton。当我点击时，它不会变暗。问题不在于选择器方法。

有人能帮助我吗？！这是代码：

- (void)drawRect:(CGRect)rect
{

    UIScrollView *scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 436)];

    UIView *detailsView = [[UIView alloc] init];

// I have other components here and after the UIButton

    UIButton *btnOpenPDF = [UIButton buttonWithType:UIButtonTypeCustom];
    [btnOpenPDF setBackgroundImage:[UIImage imageNamed:@"btnVisualizarPdf"] forState:UIControlStateNormal];
    [btnOpenPDF setFrame:CGRectMake(35, totalHeight, 249, 30)];
    btnOpenPDF.userInteractionEnabled = YES;
    [btnOpenPDF addTarget:self action:@selector(openPdf:) forControlEvents:UIControlEventTouchDown];

    [detailsView addSubview:btnOpenPDF];

    [scroll addSubview:detailsView];

    [self addSubview:scroll];

}

上面的代码在UIView中，通过方法-loadView（）通过UIViewController调用。

以下是openPdf方法：

- (IBAction)openPdf:(id)sender{
// Creates an instance of a UIWebView
    UIWebView *aWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320,450)];

// Sets the scale of web content the first time it is displayed in a web view
    aWebView.scalesPageToFit = YES;
    [aWebView setDelegate:self];

//Create a URL object.
    NSURL *urlString = [NSURL URLWithString:[NSString stringWithFormat:@"http://portalarp.com.br/portal/%@",[[[[[[[delegateFunctions products] objectAtIndex:[delegateFunctions selectedProductIndex]] objectForKey:@"ata"] objectForKey:@"nm_arquivo"] objectForKey:@"text"] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] stringByReplacingOccurrencesOfString:@"\t" withString:@""]]];

//URL Requst Object
    NSURLRequest *requestObj = [NSURLRequest requestWithURL:urlString];

//load the URL into the web view.
    [aWebView loadRequest:requestObj];

    [self addSubview:aWebView];
    [aWebView release];
}

Answer 1

drawRect是放置此代码的奇怪之处。它被称为绘制视图，并且可以想象地被称为很多 - 你不应该在那里构建视图。例如，当您触摸按钮（重绘它）时，可能会调用drawRect

如果这是在UIView中，可能init是放置此代码的更好的地方。

Answer 2

我认为问题是scrollView ..没有转发触摸事件..尝试执行以下操作：

scroll.userInteractionEnabled = YES;
scroll.exclusiveTouch = YES;

UIButton无法点击

2 个答案: