ios - 标题未显示在 UIButton 上

Question

我将以下代码用于导航栏中带有标题的自定义后退按钮。但是，没有显示标题，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，这就是为什么要这样做。

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];

Answer 1

你在按钮上设置图像而不是这个你需要设置 UIButton 的 backgroundImage 然后你的标题将被显示。

这样修改代码

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];