更改 iPhone 的 UIButton 的背景颜色

Question

我有一个问题。我使用 Button 作为 BarButtonItem。到目前为止它工作正常，但我的背景颜色只有在我单击按钮时才有效。我怎样才能让我的背景颜色每次都会被设置？

 UIButton *redEmergencyButton = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];
 redEmergencyButton.frame = CGRectMake(100, 100, 100, 50);

 redEmergencyButton.backgroundColor = [UIColor colorWithRed:0.8 
                                                      green:0.898039215686274509803
                                                       blue:1.0 
                                                      alpha:1.0];    
 [redEmergencyButton setTitle:@"Emergency" 
                     forState:UIControlStateNormal];

 [redEmergencyButton addTarget:self 
                        action:@selector(doEmergency)
              forControlEvents:UIControlEventTouchUpInside];

 UIBarButtonItem *rButton = [[UIBarButtonItem alloc] 
          initWithCustomView:redEmergencyButton];

Answer 1

您可以使用这行代码作为导航栏的

[self.navigationcontroller.navigationbar setTintColor:[UIColor bluecolor]];

按钮使用

导航按钮。

Answer 2

尝试改用此按钮：

UIBarButtonItem* emergencyButton = [[UIBarButtonItem alloc]initWithTitle:@"Emergency" style:UIBarButtonItemStyleBordered target:self action:@selector(doEmergency)];
[emergencyButton setTintColor: [UIColor colorWithRed:0.8 
                                                  green:0.898039215686274509803
                                                   blue:1.0 
                                                  alpha:1.0];

Answer 3

UIButtonTypeRoundedRect 在 iOS7 中已弃用，请使用 UIButtonTypeCustom 代替您的自定义 bgColor。

UIButton *redEmergencyButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
 redEmergencyButton.frame = CGRectMake(100, 100, 100, 50);

 redEmergencyButton.backgroundColor = [UIColor colorWithRed:0.8 
                                                      green:0.898039215686274509803
                                                       blue:1.0 
                                                      alpha:1.0];    
 [redEmergencyButton setTitle:@"Emergency" 
                     forState:UIControlStateNormal];

 [redEmergencyButton addTarget:self 
                        action:@selector(doEmergency)
              forControlEvents:UIControlEventTouchUpInside];

 UIBarButtonItem *rButton = [[UIBarButtonItem alloc] 
          initWithCustomView:redEmergencyButton];