版本记录

版本号	时间
V1.0	2017.08.04

前言

我们的app一般都需要导航栏，极个别的除外，比如说很多游戏是没有导航栏的，但是绝大部分是都有的，只要有导航栏就需要显示主题，左右item的图片或者文字，并且需要处理相关的事件，这里我就简单的封装了一个UIBarButtonItem的分类，可以快速的实现左右item图片和文字的显示，并预留了相关接口。整个框架只依赖苹果的API，不依赖其他第三方，拖入即可使用，简单方便。

预先了解

我这里写的是UIBarButtonItem的分类，可以实现导航左右item的文字以及图片的显示，并可响应相应的方法。

框架实现

下面我们就看一下所写框架的全部代码。

1. UIBarButtonItem+JJBarButtonItem.h

#import 

@interface UIBarButtonItem (JJBarButtonItem)


/**
 *   该函数的功能返回导航的leftItem
 *
 *   @param target ：目标
 *   @param selector ：响应方法
 *   @param imageNormal ：正常的图片
 *   @param imageHightlighted ：高亮的图片
 *   @param titleColorNormal ：正常文字颜色
 *   @param titleColorHightlighted ：高亮文字颜色
 *   @param title ：文字
 *
 *   @return 左边UIBarButtonItem
 */
+ (UIBarButtonItem *)jjLeftItem:(id)target
                        selector:(SEL)selector
                     imageNormal:(UIImage *)imageNormal
               imageHightlighted:(UIImage *)imageHightlighted
                titleColorNormal:(UIColor *)titleColorNormal
          titleColorHightlighted:(UIColor *)titleColorHightlighted
                           title:(NSString *)title;

/**
 *   该函数的功能返回导航的rightItem
 *
 *   @param target ：目标
 *   @param selector ：响应方法
 *   @param imageNormal ：正常的图片
 *   @param imageHightlighted ：高亮的图片
 *   @param imageDisabled ：无法点击的图片
 *   @param titleColorNormal ：正常文字颜色
 *   @param titleColorHightlighted ：高亮文字颜色
 *   @param titleColorDisabled ：无法点击的文字
 *   @param title ：文字
 *
 *   @return 右边UIBarButtonItem
 */
+ (UIBarButtonItem *)jjRightItem:(id)target
                         selector:(SEL)selector
                      imageNormal:(UIImage *)imageNormal
                imageHightlighted:(UIImage *)imageHightlighted
                    imageDisabled:(UIImage *)imageDisabled
                 titleColorNormal:(UIColor *)titleColorNormal
           titleColorHightlighted:(UIColor *)titleColorHightlighted
               titleColorDisabled:(UIColor *)titleColorDisabled
                            title:(NSString *)title;

//几种简化默认返回简化写法

+ (UIBarButtonItem *)jjDefaultBackItem:(id)target
                               selector:(SEL)selector
                                  title:(NSString *)title;

+ (UIBarButtonItem *)jjDefaultBackItem:(id)target
                               selector:(SEL)selector
                       titleColorNormal:(UIColor *)titleColorNormal
                 titleColorHightlighted:(UIColor *)titleColorHightlighted
                                  title:(NSString *)title;

+ (UIBarButtonItem *)jjDefaultRightTitleItem:(id)target
                                     selector:(SEL)selector
                                        title:(NSString *)title;

+ (UIBarButtonItem *)jjDefaultRightItem:(id)target
                                selector:(SEL)selector
                        titleColorNormal:(UIColor *)titleColorNormal
                  titleColorHightlighted:(UIColor *)titleColorHightlighted
                      titleColorDisabled:(UIColor *)titleColorDisabled
                                   title:(NSString *)title;

+ (UIBarButtonItem *)jjDefaultRightImageItem:(id)target
                                     selector:(SEL)selector
                                  imageNormal:(UIImage *)imageNormal
                            imageHightlighted:(UIImage *)imageHightlighted
                                imageDisabled:(UIImage *)imageDisabled;

- (UIButton *)jjContentViewButton;

@end

2. UIBarButtonItem+JJBarButtonItem.m

#import "UIBarButtonItem+JJBarButtonItem.h"

#define kDefaultColor     ([UIColor whiteColor])
#define  kLeftTitleFont    (17.0)
#define  kRightTitleFont   (17.0)

@implementation UIBarButtonItem (JJBarButtonItem)

+ (UIBarButtonItem *)jjLeftItem:(id)target
                        selector:(SEL)selector
                     imageNormal:(UIImage *)imageNormal
               imageHightlighted:(UIImage *)imageHightlighted
                titleColorNormal:(UIColor *)titleColorNormal
          titleColorHightlighted:(UIColor *)titleColorHightlighted
                           title:(NSString *)title
{
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.backgroundColor = [UIColor clearColor];
    [btn setImage:imageNormal forState:UIControlStateNormal];
    [btn setImage:imageHightlighted?:imageNormal forState:UIControlStateHighlighted];
    [btn setTitleColor:titleColorNormal forState:UIControlStateNormal];
    [btn setTitleColor:titleColorHightlighted?:titleColorNormal forState:UIControlStateHighlighted];
    [btn setTitle:title forState:UIControlStateNormal];
    btn.titleLabel.lineBreakMode = NSLineBreakByTruncatingTail;
    btn.titleLabel.font = [UIFont systemFontOfSize:kLeftTitleFont];
    
    // 导航栏高度
    CGFloat fNaviBarHeight = 44.0;
    
    // 图片宽度
    CGFloat fImageWidth = 0.0;
    if (imageNormal) {
        fImageWidth = imageNormal.size.width;
    }
    
    // 文本宽度
    CGFloat fTitleWidth = 0.0;
    if (title.length > 0) {
        fTitleWidth = [self jjBoundingSizeWithLabel:btn.titleLabel size:CGSizeMake([UIScreen mainScreen].bounds.size.width, fNaviBarHeight)].width;
    }
    
    // 图片、文本间隔
    CGFloat fImageAndTitleEdge = 5.0;
    CGFloat fMaxWidth = fminf(fImageWidth + fTitleWidth + fImageAndTitleEdge, [UIScreen mainScreen].bounds.size.width * 0.3);
    btn.frame = CGRectMake(0.0, 0.0, fMaxWidth, fNaviBarHeight);
    
    // 文本偏移
    CGFloat fLeftEdgeInsets = 5.0;
    if (fTitleWidth > 0.0) {
        btn.titleEdgeInsets = UIEdgeInsetsMake(0.0, -fLeftEdgeInsets, 0.0, fMaxWidth + fLeftEdgeInsets - fTitleWidth);
    }
    
    // 图片偏移
    if (fImageWidth > 0.0) {
        btn.imageEdgeInsets = UIEdgeInsetsMake(0.0, -fLeftEdgeInsets, 0.0, fMaxWidth + fLeftEdgeInsets - fImageWidth);
        btn.titleEdgeInsets = UIEdgeInsetsMake(0.0, fImageAndTitleEdge - fLeftEdgeInsets, 0.0, fLeftEdgeInsets);
    }
    
    btn.exclusiveTouch = YES;
    [btn addTarget:target action:selector forControlEvents:UIControlEventTouchUpInside];
    
    UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithCustomView:btn];
    return item;
}

+ (UIBarButtonItem *)jjRightItem:(id)target
                         selector:(SEL)selector
                      imageNormal:(UIImage *)imageNormal
                imageHightlighted:(UIImage *)imageHightlighted
                    imageDisabled:(UIImage *)imageDisabled
                 titleColorNormal:(UIColor *)titleColorNormal
           titleColorHightlighted:(UIColor *)titleColorHightlighted
               titleColorDisabled:(UIColor *)titleColorDisabled
                            title:(NSString *)title
{
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.backgroundColor = [UIColor clearColor];
    [btn setImage:imageNormal forState:UIControlStateNormal];
    [btn setImage:imageHightlighted?:imageNormal forState:UIControlStateHighlighted];
    [btn setImage:imageDisabled?:imageNormal forState:UIControlStateDisabled];
    [btn setTitleColor:titleColorNormal forState:UIControlStateNormal];
    [btn setTitleColor:titleColorHightlighted?:titleColorNormal forState:UIControlStateHighlighted];
    [btn setTitleColor:titleColorDisabled?:titleColorNormal forState:UIControlStateDisabled];
    [btn setTitle:title forState:UIControlStateNormal];
    btn.titleLabel.lineBreakMode = NSLineBreakByTruncatingTail;
    btn.titleLabel.font = [UIFont systemFontOfSize:kRightTitleFont];
    
    // 导航栏高度
    CGFloat fNaviBarHeight = 44.0;
    
    // 图片宽度
    CGFloat fImageWidth = 0.0;
    if (imageNormal) {
        fImageWidth = imageNormal.size.width;
    }
    
    // 文本宽度
    CGFloat fTitleWidth = 0.0;
    if (title.length > 0) {
        fTitleWidth = [self jjBoundingSizeWithLabel:btn.titleLabel size:CGSizeMake([UIScreen mainScreen].bounds.size.width, fNaviBarHeight)].width;
    }
    
    // 图片、文本间隔
    CGFloat fImageAndTitleEdge = 5.0;
    CGFloat fMaxWidth = fminf(fmaxf(fImageWidth + fTitleWidth + fImageAndTitleEdge, 44.0), [UIScreen mainScreen].bounds.size.width * 0.3);
    btn.frame = CGRectMake(0.0, 0.0, fMaxWidth, fNaviBarHeight);
    
    // 图片偏移
    CGFloat fRightEdgeInsets = 2.0;
    if (fImageWidth > 0.0) {
        btn.imageEdgeInsets = UIEdgeInsetsMake(0.0, fMaxWidth + fRightEdgeInsets - fImageWidth, 0.0, -fRightEdgeInsets);
    }
    
    // 文本偏移
    if (fTitleWidth > 0.0) {
        btn.imageEdgeInsets = UIEdgeInsetsZero;
        btn.titleEdgeInsets = UIEdgeInsetsMake(0.0, fRightEdgeInsets + fImageAndTitleEdge, 0.0, -fRightEdgeInsets);
    }
    
    btn.exclusiveTouch = YES;
    [btn addTarget:target action:selector forControlEvents:UIControlEventTouchUpInside];
    
    UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithCustomView:btn];
    return item;
}

+ (UIBarButtonItem *)jjDefaultBackItem:(id)target
                               selector:(SEL)selector
                                  title:(NSString *)title
{
    return [UIBarButtonItem jjLeftItem:target
                               selector:selector
                            imageNormal:[UIImage imageNamed:@"default_back_normal"]
                      imageHightlighted:[UIImage imageNamed:@"default_back_hightlighted"]
                       titleColorNormal:[self jjColorWithHexString:@"#3e3e3e" alpha:1.0]
                 titleColorHightlighted:[self jjColorWithHexString:@"#858585" alpha:1.0]
                                  title:title];
}

+ (UIBarButtonItem *)jjDefaultBackItem:(id)target
                               selector:(SEL)selector
                       titleColorNormal:(UIColor *)titleColorNormal
                 titleColorHightlighted:(UIColor *)titleColorHightlighted
                                  title:(NSString *)title
{
    return [UIBarButtonItem jjLeftItem:target
                               selector:selector
                            imageNormal:[UIImage imageNamed:@"default_back_normal"]
                      imageHightlighted:[UIImage imageNamed:@"default_back_hightlighted"]
                       titleColorNormal:titleColorNormal
                 titleColorHightlighted:titleColorHightlighted
                                  title:title];
}

+ (UIBarButtonItem *)jjDefaultRightTitleItem:(id)target
                                     selector:(SEL)selector
                                        title:(NSString *)title
{
    return [UIBarButtonItem jjRightItem:target
                                selector:selector
                             imageNormal:nil
                       imageHightlighted:nil
                           imageDisabled:nil
                        titleColorNormal:[self jjColorWithHexString:@"#3e3e3e" alpha:1.0]
                  titleColorHightlighted:[self jjColorWithHexString:@"#858585" alpha:1.0]
                      titleColorDisabled:nil
                                   title:title];
}

+ (UIBarButtonItem *)jjDefaultRightItem:(id)target
                                selector:(SEL)selector
                        titleColorNormal:(UIColor *)titleColorNormal
                  titleColorHightlighted:(UIColor *)titleColorHightlighted
                      titleColorDisabled:(UIColor *)titleColorDisabled
                                   title:(NSString *)title
{
    return [UIBarButtonItem jjRightItem:target
                                selector:selector
                             imageNormal:nil
                       imageHightlighted:nil
                           imageDisabled:nil
                        titleColorNormal:titleColorNormal
                  titleColorHightlighted:titleColorHightlighted
                      titleColorDisabled:titleColorDisabled
                                   title:title];
}

+ (UIBarButtonItem *)jjDefaultRightImageItem:(id)target
                                     selector:(SEL)selector
                                  imageNormal:(UIImage *)imageNormal
                            imageHightlighted:(UIImage *)imageHightlighted
                                imageDisabled:(UIImage *)imageDisabled
{
    return [UIBarButtonItem jjRightItem:target
                                selector:selector
                             imageNormal:imageNormal
                       imageHightlighted:imageHightlighted
                           imageDisabled:imageDisabled
                        titleColorNormal:nil
                  titleColorHightlighted:nil
                      titleColorDisabled:nil
                                   title:nil];
}

- (UIButton *)jjContentViewButton
{
    if ([self.customView isKindOfClass:[UIButton class]]) {
        return (UIButton *)(self.customView);
    }
    
    return nil;
}

/**
 *   该函数的功能返回给定label字符串占的size
 *   @param label ：字符串的label
 *   @param size ：字符串占的size
 */
+ (CGSize)jjBoundingSizeWithLabel:(UILabel *)label size:(CGSize)size
{
    NSStringDrawingOptions options = NSStringDrawingUsesLineFragmentOrigin;
    options |= NSStringDrawingUsesFontLeading;
    options |= NSStringDrawingTruncatesLastVisibleLine;
    CGRect rect = [label.text boundingRectWithSize:size
                                     options:options
                                  attributes:@{NSFontAttributeName:label.font}
                                     context:nil];
    // 加两个像素, 防止emoji被切掉
    return CGSizeMake(ceilf(rect.size.width) + 1.0, ceilf(rect.size.height) + 2.0);
}

/**
 *   该函数的功能就是根据给的十六进制数和透明度返回对应的颜色值
 *   @param stringToConvert ：十六进制字符串
 *   @param alpha ：透明度
 */
+ (UIColor *)jjColorWithHexString:(NSString *)stringToConvert alpha:(CGFloat)alpha
{
    NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    
    if ([cString length] < 6) {
        return kDefaultColor;
    }
    
    if ([cString hasPrefix:@"#"]) {
        cString = [cString substringFromIndex:1];
    }
    
    if ([cString length] != 6) {
        return kDefaultColor;
    }
    
    NSRange range = NSMakeRange(0, 2);
    NSString *rString = [cString substringWithRange:range];
    
    range.location = 2;
    NSString *gString = [cString substringWithRange:range];
    
    range.location = 4;
    NSString *bString = [cString substringWithRange:range];
    
    unsigned int red = 0, green = 0, blue = 0;
    if ([[NSScanner scannerWithString:rString] scanHexInt:&red] &&
        [[NSScanner scannerWithString:gString] scanHexInt:&green] &&
        [[NSScanner scannerWithString:bString] scanHexInt:&blue]) {
        return [UIColor colorWithRed:((float)red / 255.0f)
                               green:((float)green / 255.0f)
                                blue:((float)blue / 255.0f)
                               alpha:alpha];
    }
    
    return kDefaultColor;
}

@end

别的就不多说了，代码就这么多。

框架验证

下面就验证下框架的使用，我们先写个类调用下试试。

1. JJNavigationVC.m

#import "JJNavigationVC.h"
#import "UIBarButtonItem+JJBarButtonItem.h"

@interface JJNavigationVC ()

@end

@implementation JJNavigationVC

#pragma mark - Override Base Function

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.title = @"无题";
    self.view.backgroundColor = [UIColor lightGrayColor];
    
    //左边item
    self.navigationItem.leftBarButtonItem = [UIBarButtonItem jjLeftItem:self
                                                               selector:@selector(backButtonDidClick)
                                                            imageNormal:[UIImage imageNamed:@"my_sezhi1"]
                                                      imageHightlighted:[UIImage imageNamed:@"my_sezhi1"]
                                                       titleColorNormal:[UIColor blueColor]
                                                 titleColorHightlighted:[UIColor redColor]
                                                                  title:@"返回"
                                             ];
    
    //右边的item
    self.navigationItem.rightBarButtonItem = [UIBarButtonItem jjRightItem:self
                                                                 selector:@selector(collectionButtonDidClick)
                                                              imageNormal:[UIImage imageNamed:@"my_shoucang1"]
                                                        imageHightlighted:[UIImage imageNamed:@"my_shoucang1"]
                                                            imageDisabled:[UIImage imageNamed:@"my_shoucang1"]
                                                         titleColorNormal:[UIColor blueColor]
                                                   titleColorHightlighted:[UIColor redColor]
                                                       titleColorDisabled:[UIColor blackColor]
                                                                    title:@"收藏"
                                              ];
}

#pragma mark - Action && Notification

- (void)backButtonDidClick
{
    NSLog(@"返回按钮");
}

- (void)collectionButtonDidClick
{
    NSLog(@"收藏按钮");
}

@end

下面我们看一下效果展示。

效果展示

这里文字大小我设置的是17号字体，里面定义的宏，想修改的直接修改宏就可以了。

#define  kLeftTitleFont    (17.0)
#define  kRightTitleFont   (17.0)

后记

希望我写的这个小框架能对大家有所帮助，谢谢大家的关注~~，继续努力。

冬

一种UIBarButtonItem的简单封装

版本记录

前言

预先了解

框架实现

框架验证

后记

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