如何自定义导航栏？

Question

如何自定义导航栏或在导航栏中添加背景图片和导航栏按钮？请用简单的方式告诉我，不要让我的答案难懂，我不是专家，而且？一步一步地解释。

Answer 1

在.m文件中添加上述@implementation中的代码

- (void)drawRect:(CGRect)rect {


/  UIImage *image = [UIImage imageNamed: @"navigation_bar.png"];
 UIImage *image = [UIImage imageNamed: @"navigationbarnew2.png"];
  [image drawInRect:CGRectMake(0, 0, self.frame.size.width, 44)];


}


@end

要将按钮添加到导航栏，请在viewdidload中添加以下代码

UIImage* image3 = [UIImage imageNamed:@"mail-48_24.png"];
CGRect frameimg = CGRectMake(0, 0, image3.size.width, image3.size.height);
UIButton *someButton = [[UIButton alloc] initWithFrame:frameimg];
[someButton setBackgroundImage:image3 forState:UIControlStateNormal];
[someButton addTarget:self action:@selector(sendmail)
     forControlEvents:UIControlEventTouchUpInside];
[someButton setShowsTouchWhenHighlighted:YES];

mailbutton =[[UIBarButtonItem alloc] initWithCustomView:someButton];
self.navigationItem.rightBarButtonItem=mailbutton;
[someButton release];

Answer 2

不幸的是，你正在寻找的东西并不是那么容易满足的。所需的技术更像是一种变通方法，而不是一种可行的解决方案，它被称为方法swizzling，这里有一个教程，介绍如何在导航栏上应用它，以便在导航栏中获得自定义背景图像：http://sebastiancelis.com/2009/12/21/adding-background-image-uinavigationbar/

向导航栏添加按钮相当简单。假设您的导航栏被实例化为navigationController：

UIBarButtonItem *yourButton = [[UIBarButtonItem alloc] initWithTitle:@"Hello" style: UIBarButtonStylePlain target:self action:@selector(myTargetMethodSignature:)];
navigationController.navigationItem.rightBarButtonItem = yourButton;
[yourButton release];

希望这能有所帮助。芥末

Answer 3

遵循本教程：How do iPhone apps Instagram/Reeder/DailyBooth implement custom NavigationBars with variable width back buttons?。它包括一个源代码示例。