自定义UINavigationBar和后退按钮 [英] Customization of UINavigationBar and the back button

问题描述

我按照下面的教程来自定义UINavigationBar。

取消/完成按钮

I followed the tutorial below to customize the UINavigationBar.

http://foobarpig.com/iphone/uinavigationbar-with-solid-color-or-image-background.html

I applied a background image in the UINavigationBar, however, I do not know how to customize the back button. At the moment, the default back button does not suits the look & feel of the customized UINavigationBar.

Please teach me how to change the background color or image of the default back button. Thank you.

解决方案

I've written the following categories to customize the back button:

UIBarButtonItem+StyledButton.h

@interface UIBarButtonItem (StyledButton)
+ (UIBarButtonItem *)styledBackBarButtonItemWithTarget:(id)target selector:(SEL)selector;
+ (UIBarButtonItem *)styledCancelBarButtonItemWithTarget:(id)target selector:(SEL)selector;
+ (UIBarButtonItem *)styledSubmitBarButtonItemWithTitle:(NSString *)title target:(id)target selector:(SEL)selector;
@end

UIBarButtonItem+StyledButton.m

@implementation UIBarButtonItem (StyledButton)

+ (UIBarButtonItem *)styledBackBarButtonItemWithTarget:(id)target selector:(SEL)selector;
{
   UIImage *image = [UIImage imageNamed:@"button_back"];
   image = [image stretchableImageWithLeftCapWidth:20.0f topCapHeight:20.0f];

   NSString *title = NSLocalizedString(@"Back", nil);
   UIFont *font = [UIFont boldSystemFontOfSize:12.0f];

   UIButton *button = [UIButton styledButtonWithBackgroundImage:image font:font title:title target:target selector:selector];
   button.titleLabel.textColor = [UIColor blackColor];

   CGSize textSize = [title sizeWithFont:font];
   CGFloat margin = (button.frame.size.height - textSize.height) / 2;
   CGFloat marginRight = 7.0f;
   CGFloat marginLeft = button.frame.size.width - textSize.width - marginRight;
   [button setTitleEdgeInsets:UIEdgeInsetsMake(margin, marginLeft, margin, marginRight)]; 
   [button setTitleColor:[UIColor colorWithRed:53.0f/255.0f green:77.0f/255.0f blue:99.0f/255.0f alpha:1.0f] forState:UIControlStateNormal];   

   return [[[UIBarButtonItem alloc] initWithCustomView:button] autorelease];
}

+ (UIBarButtonItem *)styledCancelBarButtonItemWithTarget:(id)target selector:(SEL)selector;
{
   UIImage *image = [UIImage imageNamed:@"button_square"];
   image = [image stretchableImageWithLeftCapWidth:20.0f topCapHeight:20.0f];

   NSString *title = NSLocalizedString(@"Cancel", nil);
   UIFont *font = [UIFont boldSystemFontOfSize:12.0f];

   UIButton *button = [UIButton styledButtonWithBackgroundImage:image font:font title:title target:target selector:selector];   
   button.titleLabel.textColor = [UIColor blackColor];   
   [button setTitleColor:[UIColor colorWithRed:53.0f/255.0f green:77.0f/255.0f blue:99.0f/255.0f alpha:1.0f] forState:UIControlStateNormal];   

   return [[[UIBarButtonItem alloc] initWithCustomView:button] autorelease];
}

+ (UIBarButtonItem *)styledSubmitBarButtonItemWithTitle:(NSString *)title target:(id)target selector:(SEL)selector;
{
   UIImage *image = [UIImage imageNamed:@"button_submit"];
   image = [image stretchableImageWithLeftCapWidth:20.0f topCapHeight:20.0f];

   UIFont *font = [UIFont boldSystemFontOfSize:12.0f];

   UIButton *button = [UIButton styledButtonWithBackgroundImage:image font:font title:title target:target selector:selector];
   button.titleLabel.textColor = [UIColor whiteColor];
   [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];   

   return [[[UIBarButtonItem alloc] initWithCustomView:button] autorelease];
}

UIButton+StyledButton.h

@interface UIButton (UIButton_StyledButton)
+ (UIButton *)styledButtonWithBackgroundImage:(UIImage *)image font:(UIFont *)font title:(NSString *)title target:(id)target selector:(SEL)selector;
@end

UIButton+StyledButton.m

@implementation UIButton (UIButton_StyledButton)

+ (UIButton *)styledButtonWithBackgroundImage:(UIImage *)image font:(UIFont *)font title:(NSString *)title target:(id)target selector:(SEL)selector
{
   CGSize textSize = [title sizeWithFont:font];
   CGSize buttonSize = CGSizeMake(textSize.width + 20.0f, image.size.width);

   UIButton *button = [[[UIButton alloc] initWithFrame:CGRectMake(0.0f, 0.0f, buttonSize.width, buttonSize.height)] autorelease];
   [button addTarget:target action:selector forControlEvents:UIControlEventTouchUpInside];
   [button setBackgroundImage:image forState:UIControlStateNormal];
   [button setTitle:title forState:UIControlStateNormal];
   [button.titleLabel setFont:font];

   return button;
}

@end

---

It's easy to use, e.g.:

- (void)viewDidLoad
{
   [super viewDidLoad];

   self.navigationItem.leftBarButtonItem = [UIBarButtonItem styledBackBarButtonItemWithTarget:self selector:@selector(dismissModalViewController)];
   self.navigationItem.rightBarButtonItem = [UIBarButtonItem styledSubmitBarButtonItemWithTitle:NSLocalizedString(@"Done", nil) target:self selector:@selector(doneButtonTouched:)];
}

---

The above code is from a project that's still work-in-progress, so it could be cleaned up a bit, but it works as supposed to. Use images without text as buttons and make sure they're stretchable (i.e. don't make the images too small and be careful with gradients). The image of the back button in the following example is only 31 x 30 pixels, but it's stretched to make the text fit.

Some examples of the results:

Back button

Cancel / Done buttons

这篇关于自定义UINavigationBar和后退按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！