Question

在我的应用程序中，我正在使用MFMailComposeViewController。我在标题栏中放置了back和Done按钮。我的标题栏是黑色的，但我有蓝色的按钮背景。如何将按钮背景颜色更改为black颜色？

Answer 1

首先必须更改按钮样式： barButton.style = UIBarButtonItemStyleBordered;

然后，可以使用以下代码更改导航栏按钮的颜色：

[[mailComposer navigationBar] setTintColor:[UIColor blackColor]];

Answer 2

我按照此处添加了自定义按钮，取代了标准的取消和发送按钮：

// Fetch the UINavigationItem object of the nav bar
UINavigationItem *mailVCNavItem = [mailVC.navigationBar.items objectAtIndex:0];

// Get the old bar button item to fetch the action and target.
UIBarButtonItem *oldCancelBarButton = [mailVCNavItem leftBarButtonItem];

// Create your new custom bar button item. 
// In my case I have UIButton with image set as a custom view within a bar button item.
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
[backButton setImage:[UIImage imageNamed:@"backButton.png"] forState:UIControlStateNormal];
[backButton addTarget:oldCancelBarButton.target action:oldCancelBarButton.action forControlEvents:UIControlEventTouchUpInside];
backButton.bounds = CGRectMake(0.0, 0.0, 40.0, 25.0);
[[barButtonItems objectAtIndex:0] setLeftBarButtonItem:[[UIBarButtonItem alloc] initWithCustomView:backButton]];

很遗憾，我无法更换发送按钮。

它只是使按钮无效。

Answer 3

对于Swift（我使用的是Swift 1.2）

var mc: MFMailComposeViewController = MFMailComposeViewController()
mc.mailComposeDelegate = self
mc.setSubject(emailTitle)
mc.setToRecipients(toRecipients)
mc.navigationBar.tintColor = UIColor.blackColor()

如何更改MFMailComposeViewController中的按钮？

3 个答案: