Question

在查看这个简单主题的帖子后，我仍然无法弄清楚我在这里做错了什么。我试图使按钮在同一个viewController中循环执行相同的操作。

当视图进入屏幕时，按钮不会单击（或者至少NSLog不会写入第一次输入此代码时所执行的控制台。）

- (IBAction)answer: (id) sender{
NSLog(@"The Number is: %d\n",qNumber);
qNumber+=1;

UIView *newView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
[newView setUserInteractionEnabled:TRUE];
UIImage *buttonImage = [UIImage imageNamed:@"pink_button.png"];
UIImageView *buttonImageView = [[[UIImageView alloc] initWithFrame:CGRectMake(23, 294, 72, 37)] autorelease];
[buttonImageView setImage:buttonImage];

UILabel* buttonLabel = [[[UILabel alloc] initWithFrame:CGRectMake(23, 294, 72, 37)] autorelease];
buttonLabel.text = @"newLow";
buttonLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size: 15.0];
buttonLabel.textColor = [UIColor blackColor];
buttonLabel.backgroundColor = [UIColor  clearColor];
buttonLabel.textAlignment = UITextAlignmentCenter;

lowButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
[lowButton addSubview:buttonImageView];
[lowButton addSubview:buttonLabel];
[lowButton addTarget:self action:@selector(answer:) forControlEvents:UIControlEventTouchUpInside];

[newView addSubview:lowButton];
self.view = newView;
}

感谢您提供的任何帮助......即使我错过了一些简单的事情： - ）

最新更新代码：

lowButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
[newView addSubview:buttonImageView];
[newView addSubview:buttonLabel];
[lowButton addTarget:self action:@selector(answer:) forControlEvents:UIControlEventTouchUpInside];

[newView addSubview:lowButton];
[self.view bringSubviewToFront:lowButton];
self.view = newView;

当按下按钮时，它仍然不会输入动作代码。

Answer 1

你的按钮需要一个框架。你无法点击无框按钮。

lowButton.frame = CGRectMake(23, 294, 72, 37);

此外，当您向该按钮添加标签和图像时，它们的框架应具有x和y 0。

UIImageView *buttonImageView = [[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 72, 37)] autorelease];
...
UILabel* buttonLabel = [[[UILabel alloc] initWithFrame:CGRectMake(0, 0, 72, 37)] autorelease];
...

但是，如果有UIBmage和UILabel的标签和背景视图属性，我可以问你为什么要添加新的UIImageView和UILabel？

编辑这里有一个清理过的代码：

UIView *newView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];

lowButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
[lowButton setImage:[UIImage imageNamed:@"pink_button.png"] forState:UIControlStateNormal];
[lowButton setTitle:@"newLow" forState:UIControlStateNormal];
[lowButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[lowButton.titleLabel setFont:[UIFont boldSystemFontOfSize:15.0]];
[lowButton addTarget:self action:@selector(answer:) forControlEvents:UIControlEventTouchUpInside];

[newView addSubview:lowButton];
self.view = newView;

注意我也删除了[newView setUserInteractionEnabled:TRUE];，因为它是默认启用的。

Answer 2

您的自定义按钮的子视图覆盖了按钮，因此不会获得任何点击。尝试将所有子视图添加到newView而不是lowButton（包括lowButton本身），然后调用

[self.view bringSubViewToFront:lowButton];

自定义UIButton无法正常工作

2 个答案: