UIButton 上未显示标题

发布于 2024-11-25 20:40:07 字数 921 浏览 3 评论 0原文

我正在使用以下代码作为导航栏中带有标题的自定义后退按钮。但是，标题没有显示，有什么帮助吗？

注意：后退按钮图像是黑色的，与 ios 默认使用的图像相同，需要自定义操作处理程序，这就是为什么这样做。

backButton=[UIButton buttonWithType:UIButtonTypeCustom];
[backButton setImage:[UIImage imageNamed:@"backbutton.png"] forState:UIControlStateNormal];
[backButton setImage:[UIImage imageNamed:@"backbutton.png"] forState:UIControlStateSelected];    
[backButton addTarget:self action:@selector(customBack) forControlEvents:UIControlEventTouchUpInside];
[backButton setFrame:CGRectMake(0,0,64,32)];
[backButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[backButton setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected];
[backButton setTitle:@"Encameo" forState:UIControlStateNormal];
[backButton setTitle:@"Encameo" forState:UIControlStateSelected];

self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc] initWithCustomView: backButton];

原文

I am using the following code for a custom back button with title in the nav bar. However, the title is not being shown, any help ?

nb: the back button image is black and the same one thats used by default by ios, needed to customize the action handler, thats why did it this way.

backButton=[UIButton buttonWithType:UIButtonTypeCustom];
[backButton setImage:[UIImage imageNamed:@"backbutton.png"] forState:UIControlStateNormal];
[backButton setImage:[UIImage imageNamed:@"backbutton.png"] forState:UIControlStateSelected];    
[backButton addTarget:self action:@selector(customBack) forControlEvents:UIControlEventTouchUpInside];
[backButton setFrame:CGRectMake(0,0,64,32)];
[backButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[backButton setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected];
[backButton setTitle:@"Encameo" forState:UIControlStateNormal];
[backButton setTitle:@"Encameo" forState:UIControlStateSelected];

self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc] initWithCustomView: backButton];

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傲娇萝莉攻 2024-12-02 20:40:07

您正在按钮上设置图像，而不是您需要设置 UIButton 的背景图像，然后将显示您的标题。

像这样更改代码

backButton=[UIButton buttonWithType:UIButtonTypeCustom];
[backButton setBackgroundImage:[UIImage imageNamed:@"backbutton.png"] forState:UIControlStateNormal];
[backButton setBackgroundImage:[UIImage imageNamed:@"backbutton.png"] forState:UIControlStateSelected];    
[backButton addTarget:self action:@selector(customBack) forControlEvents:UIControlEventTouchUpInside];
[backButton setFrame:CGRectMake(0,0,64,32)];
[backButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[backButton setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected];
[backButton setTitle:@"Encameo" forState:UIControlStateNormal];
[backButton setTitle:@"Encameo" forState:UIControlStateSelected];

self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc] initWithCustomView: backButton];

You are setting image on button instead of this you need to set backgroundImage of UIButton then your title will be displayed.

Change the code like this

backButton=[UIButton buttonWithType:UIButtonTypeCustom];
[backButton setBackgroundImage:[UIImage imageNamed:@"backbutton.png"] forState:UIControlStateNormal];
[backButton setBackgroundImage:[UIImage imageNamed:@"backbutton.png"] forState:UIControlStateSelected];    
[backButton addTarget:self action:@selector(customBack) forControlEvents:UIControlEventTouchUpInside];
[backButton setFrame:CGRectMake(0,0,64,32)];
[backButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[backButton setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected];
[backButton setTitle:@"Encameo" forState:UIControlStateNormal];
[backButton setTitle:@"Encameo" forState:UIControlStateSelected];

self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc] initWithCustomView: backButton];

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