角标 (标签栏,导航栏)

标签栏 UITabBarItem 角标

[A].UITabBar默认角标

UITabBar默认角标：（可以显示 角标，也可以会显示 数量）

UITabBarItem * item=[self.tabBarController.tabBar.items objectAtIndex:2];
if (_numberOfMsgs != 0) {
   //TabBarItem: 显示角标  
   item.badgeValue = @"";//仅仅显示角标

   //显示数量
   //item.badgeValue = [NSString stringWithFormat:@"%d",_numberOfMsgs];
} else { 
   //无 消息  （数量为：0）
   item.badgeValue = nil;
}

效果：

[B].自定义角标：添加类别

UITabBar自定义角标：根据自己App要求，调整了角标的大小、颜色，取消了数值的显示！

添加 “UITabBar+badge”类别！

在**UITabBar+badge.h**文件：

#import <UIKit/UIKit.h>

@interface UITabBar (badge)

- (void)showBadgeOnItemIndex:(int)index; //显示小红点

- (void)hideBadgeOnItemIndex:(int)index; //隐藏小红点

@end

在**UITabBar+badge.m**文件：

#import "UITabBar+badge.h"

//App要求的红色
#define RedAppColor [UIColor colorWithRed:246.f/255.f green:96.f/255.f blue:96.f/255.f alpha:1.f]

#define TabbarItemNums 5.0 //根据需求，设置 tabbar的角标数量

@implementation UITabBar (badge)

//显示小红点
- (void)showBadgeOnItemIndex:(int)index{
   //移除之前的小红点
   [self removeBadgeOnItemIndex:index];

   //新建小红点
   UIView *badgeView = [[UIView alloc]init];
   badgeView.tag = 666 + index;
   badgeView.layer.cornerRadius = 5.f;//圆形  (切圆角)
   badgeView.backgroundColor = RedAppColor;//颜色：App要求的红色
   CGRect tabFrame = self.frame;

   //确定小红点的位置
   float percentX = (index +0.6) / TabbarItemNums;
   CGFloat x = ceilf(percentX * tabFrame.size.width);
   CGFloat y = ceilf(0.1 * tabFrame.size.height);
   badgeView.frame = CGRectMake(x, y, 10, 10);//圆形大小为10
   [self addSubview:badgeView];
}



//隐藏小红点
- (void)hideBadgeOnItemIndex:(int)index{
   //移除小红点
   [self removeBadgeOnItemIndex:index];
}

//移除小红点
- (void)removeBadgeOnItemIndex:(int)index{
   //按照tag值进行移除
   for (UIView *subView in self.subviews) {
       if (subView.tag == 666+index) {
           [subView removeFromSuperview];
       }
   }
}

@end

自定义角标 使用：

if (_numberOfMsgs != 0) {
    [self.tabBar showBadgeOnItemIndex:2]; //显示角标（根据item位置）
} else {
   [self.tabBar hideBadgeOnItemIndex:2]; //隐藏角标（根据item位置）
}

效果：

细节：

##导航栏UIBarButtonItem 角标

添加 “UIBarButtonItem+NavBarBadge”类别！

在“UIBarButtonItem+NavBarBadge.h”文件：

#import <UIKit/UIKit.h>

@interface UIBarButtonItem (NavBarBadge)

// Badge value to be display
@property (nonatomic) NSString *badgeValue;

// Badge background color
@property (nonatomic) UIColor *badgeBGColor;
// Badge text color
@property (nonatomic) UIColor *badgeTextColor;
// Badge font
@property (nonatomic) UIFont *badgeFont;

// Padding value for the badge
@property (nonatomic) CGFloat badgePadding;

// Minimum size badge to small
@property (nonatomic) CGFloat badgeMinSize;
// Values for offseting the badge over the BarButtonItem you picked
@property (nonatomic) CGFloat badgeOriginX;
@property (nonatomic) CGFloat badgeOriginY;

// In case of numbers, remove the badge when reaching zero
@property BOOL shouldHideBadgeAtZero;
// Badge has a bounce animation when value changes
@property BOOL shouldAnimateBadge;


@end

在“UIBarButtonItem+NavBarBadge.m”文件：

#import "UIBarButtonItem+NavBarBadge.h"
#import <objc/runtime.h> 

   
NSString const *UIBarButtonItem_badgeKey = @"UIBarButtonItem_badgeKey";

NSString const *UIBarButtonItem_badgeBGColorKey = @"UIBarButtonItem_badgeBGColorKey";
NSString const *UIBarButtonItem_badgeTextColorKey = @"UIBarButtonItem_badgeTextColorKey";
NSString const *UIBarButtonItem_badgeFontKey = @"UIBarButtonItem_badgeFontKey";
NSString const *UIBarButtonItem_badgePaddingKey = @"UIBarButtonItem_badgePaddingKey";
NSString const *UIBarButtonItem_badgeMinSizeKey = @"UIBarButtonItem_badgeMinSizeKey";
NSString const *UIBarButtonItem_badgeOriginXKey = @"UIBarButtonItem_badgeOriginXKey";
NSString const *UIBarButtonItem_badgeOriginYKey = @"UIBarButtonItem_badgeOriginYKey";
NSString const *UIBarButtonItem_shouldHideBadgeAtZeroKey = @"UIBarButtonItem_shouldHideBadgeAtZeroKey";
NSString const *UIBarButtonItem_shouldAnimateBadgeKey = @"UIBarButtonItem_shouldAnimateBadgeKey";
NSString const *UIBarButtonItem_badgeValueKey = @"UIBarButtonItem_badgeValueKey";


     
@implementation UIBarButtonItem (NavBarBadge)

@dynamic badgeValue, badgeBGColor, badgeTextColor, badgeFont;
@dynamic badgePadding, badgeMinSize, badgeOriginX, badgeOriginY;
@dynamic shouldHideBadgeAtZero, shouldAnimateBadge;

- (void)badgeInit
{
    UIView *superview = nil;
    CGFloat defaultOriginX = 0;
    if (self.customView) {
        superview = self.customView;
        defaultOriginX = superview.frame.size.width - self.badge.frame.size.width/2;
        // Avoids badge to be clipped when animating its scale
        superview.clipsToBounds = NO;
    } else if ([self respondsToSelector:@selector(view)] && [(id)self view]) {
        superview = [(id)self view];
        defaultOriginX = superview.frame.size.width - self.badge.frame.size.width;
    }
    [superview addSubview:self.badge];

    
    // Default design initialization
    self.badgeBGColor   = [UIColor redColor];
    self.badgeTextColor = [UIColor whiteColor];
    self.badgeFont      = [UIFont systemFontOfSize:12.0];
    self.badgePadding   = 6;
    self.badgeMinSize   = 8;
    self.badgeOriginX   = defaultOriginX;
    self.badgeOriginY   = -4;
    self.shouldHideBadgeAtZero = YES;
    self.shouldAnimateBadge = YES;
}





#pragma mark - Utility methods

// Handle badge display when its properties have been changed (color, font, ...)
- (void)refreshBadge
{
    // Change new attributes
    self.badge.textColor        = self.badgeTextColor;
    self.badge.backgroundColor  = self.badgeBGColor;
    self.badge.font             = self.badgeFont;
    
    if (!self.badgeValue || [self.badgeValue isEqualToString:@""] || ([self.badgeValue isEqualToString:@"0"] && self.shouldHideBadgeAtZero)) {
        self.badge.hidden = YES;
    } else {
        self.badge.hidden = NO;
        [self updateBadgeValueAnimated:YES];
    }
    
}

- (CGSize) badgeExpectedSize
{
    // When the value changes the badge could need to get bigger
    // Calculate expected size to fit new value
    // Use an intermediate label to get expected size thanks to sizeToFit
    // We don't call sizeToFit on the true label to avoid bad display
    UILabel *frameLabel = [self duplicateLabel:self.badge];
    [frameLabel sizeToFit];
    
    CGSize expectedLabelSize = frameLabel.frame.size;
    return expectedLabelSize;
}

- (void)updateBadgeFrame
{
    
    CGSize expectedLabelSize = [self badgeExpectedSize];
    
    // Make sure that for small value, the badge will be big enough
    CGFloat minHeight = expectedLabelSize.height;
    
    // Using a const we make sure the badge respect the minimum size
    minHeight = (minHeight < self.badgeMinSize) ? self.badgeMinSize : expectedLabelSize.height;
    CGFloat minWidth = expectedLabelSize.width;
    CGFloat padding = self.badgePadding;
    
    // Using const we make sure the badge doesn't get too smal
    minWidth = (minWidth < minHeight) ? minHeight : expectedLabelSize.width;
    self.badge.layer.masksToBounds = YES;
    
    
//    self.badge.frame = CGRectMake(self.badgeOriginX, self.badgeOriginY, minWidth + padding, minHeight + padding);
    if (self.badge.text.length > 2) {
        self.badge.frame = CGRectMake(-10, -5, minWidth + padding, minHeight + padding);

    } else {
        self.badge.frame = CGRectMake(-5, -5, minWidth + padding, minHeight + padding);
    }

    self.badge.layer.cornerRadius = (minHeight + padding) / 2;
}

// Handle the badge changing value
- (void)updateBadgeValueAnimated:(BOOL)animated
{
    // Bounce animation on badge if value changed and if animation authorized
    if (animated && self.shouldAnimateBadge && ![self.badge.text isEqualToString:self.badgeValue]) {
        CABasicAnimation * animation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
        [animation setFromValue:[NSNumber numberWithFloat:1.5]];
        [animation setToValue:[NSNumber numberWithFloat:1]];
        [animation setDuration:0.2];
        [animation setTimingFunction:[CAMediaTimingFunction functionWithControlPoints:.4f :1.3f :1.f :1.f]];
        [self.badge.layer addAnimation:animation forKey:@"bounceAnimation"];
    }
    
    
    // Set the new value
    self.badge.text = self.badgeValue;
    
    // Animate the size modification if needed
    if (animated && self.shouldAnimateBadge) {
        [UIView animateWithDuration:0.2 animations:^{
            [self updateBadgeFrame];
        }];
    } else {
        [self updateBadgeFrame];
    }
}

- (UILabel *)duplicateLabel:(UILabel *)labelToCopy
{
    UILabel *duplicateLabel = [[UILabel alloc] initWithFrame:labelToCopy.frame];
    duplicateLabel.text = labelToCopy.text;
    duplicateLabel.font = labelToCopy.font;
    
    return duplicateLabel;
}

- (void)removeBadge
{
    // Animate badge removal
    [UIView animateWithDuration:0.2 animations:^{
        self.badge.transform = CGAffineTransformMakeScale(0, 0);
    } completion:^(BOOL finished) {
        [self.badge removeFromSuperview];
        self.badge = nil;
    }];
}

#pragma mark - getters/setters
-(UILabel*) badge {
    UILabel* lbl = objc_getAssociatedObject(self, &UIBarButtonItem_badgeKey);
    if(lbl==nil) {
        lbl = [[UILabel alloc] initWithFrame:CGRectMake(self.badgeOriginX, self.badgeOriginY, 20, 20)];
        [self setBadge:lbl];
        [self badgeInit];
        [self.customView addSubview:lbl];
        lbl.textAlignment = NSTextAlignmentCenter;
    }
    return lbl;
}
-(void)setBadge:(UILabel *)badgeLabel
{
    objc_setAssociatedObject(self, &UIBarButtonItem_badgeKey, badgeLabel, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

// Badge value to be display
-(NSString *)badgeValue {
    return objc_getAssociatedObject(self, &UIBarButtonItem_badgeValueKey);
}
-(void)setBadgeValue:(NSString *)badgeValue
{
    if (badgeValue.length > 2) {
        badgeValue = @"99+";
    }
    
    objc_setAssociatedObject(self, &UIBarButtonItem_badgeValueKey, badgeValue, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    
    // When changing the badge value check if we need to remove the badge
    [self updateBadgeValueAnimated:YES];
    [self refreshBadge];
}

// Badge background color
-(UIColor *)badgeBGColor {
    return objc_getAssociatedObject(self, &UIBarButtonItem_badgeBGColorKey);
}
-(void)setBadgeBGColor:(UIColor *)badgeBGColor
{
    objc_setAssociatedObject(self, &UIBarButtonItem_badgeBGColorKey, badgeBGColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    if (self.badge) {
        [self refreshBadge];
    }
}

// Badge text color
-(UIColor *)badgeTextColor {
    return objc_getAssociatedObject(self, &UIBarButtonItem_badgeTextColorKey);
}
-(void)setBadgeTextColor:(UIColor *)badgeTextColor
{
    objc_setAssociatedObject(self, &UIBarButtonItem_badgeTextColorKey, badgeTextColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    if (self.badge) {
        [self refreshBadge];
    }
}

// Badge font
-(UIFont *)badgeFont {
    return objc_getAssociatedObject(self, &UIBarButtonItem_badgeFontKey);
}
-(void)setBadgeFont:(UIFont *)badgeFont
{
    objc_setAssociatedObject(self, &UIBarButtonItem_badgeFontKey, badgeFont, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    if (self.badge) {
        [self refreshBadge];
    }
}

// Padding value for the badge
-(CGFloat) badgePadding {
    NSNumber *number = objc_getAssociatedObject(self, &UIBarButtonItem_badgePaddingKey);
    return number.floatValue;
}
-(void) setBadgePadding:(CGFloat)badgePadding
{
    NSNumber *number = [NSNumber numberWithDouble:badgePadding];
    objc_setAssociatedObject(self, &UIBarButtonItem_badgePaddingKey, number, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    if (self.badge) {
        [self updateBadgeFrame];
    }
}

// Minimum size badge to small
-(CGFloat) badgeMinSize {
    NSNumber *number = objc_getAssociatedObject(self, &UIBarButtonItem_badgeMinSizeKey);
    return number.floatValue;
}
-(void) setBadgeMinSize:(CGFloat)badgeMinSize
{
    NSNumber *number = [NSNumber numberWithDouble:badgeMinSize];
    objc_setAssociatedObject(self, &UIBarButtonItem_badgeMinSizeKey, number, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    if (self.badge) {
        [self updateBadgeFrame];
    }
}

// Values for offseting the badge over the BarButtonItem you picked
-(CGFloat) badgeOriginX {
    NSNumber *number = objc_getAssociatedObject(self, &UIBarButtonItem_badgeOriginXKey);
    return number.floatValue;
}
-(void) setBadgeOriginX:(CGFloat)badgeOriginX
{
    NSNumber *number = [NSNumber numberWithDouble:badgeOriginX];
    objc_setAssociatedObject(self, &UIBarButtonItem_badgeOriginXKey, number, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    if (self.badge) {
        [self updateBadgeFrame];
    }
}

-(CGFloat) badgeOriginY {
    NSNumber *number = objc_getAssociatedObject(self, &UIBarButtonItem_badgeOriginYKey);
    return number.floatValue;
}
-(void) setBadgeOriginY:(CGFloat)badgeOriginY
{
    NSNumber *number = [NSNumber numberWithDouble:badgeOriginY];
    objc_setAssociatedObject(self, &UIBarButtonItem_badgeOriginYKey, number, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    if (self.badge) {
        [self updateBadgeFrame];
    }
}

// In case of numbers, remove the badge when reaching zero
-(BOOL) shouldHideBadgeAtZero {
    NSNumber *number = objc_getAssociatedObject(self, &UIBarButtonItem_shouldHideBadgeAtZeroKey);
    return number.boolValue;
}
- (void)setShouldHideBadgeAtZero:(BOOL)shouldHideBadgeAtZero
{
    NSNumber *number = [NSNumber numberWithBool:shouldHideBadgeAtZero];
    objc_setAssociatedObject(self, &UIBarButtonItem_shouldHideBadgeAtZeroKey, number, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    if(self.badge) {
        [self refreshBadge];
    }
}

// Badge has a bounce animation when value changes
-(BOOL) shouldAnimateBadge {
    NSNumber *number = objc_getAssociatedObject(self, &UIBarButtonItem_shouldAnimateBadgeKey);
    return number.boolValue;
}
- (void)setShouldAnimateBadge:(BOOL)shouldAnimateBadge
{
    NSNumber *number = [NSNumber numberWithBool:shouldAnimateBadge];
    objc_setAssociatedObject(self, &UIBarButtonItem_shouldAnimateBadgeKey, number, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    if(self.badge) {
        [self refreshBadge];
    }
}

@end

代码使用了“运行时”：在对象使用时，才确定下来该对象！

记不清代码哪里copy的了！就不标明出处了！！！！！

哈哈！😂😂😂😂😂😂😂😂😂😂😂😂😂

自己就做了数值判断、颜色等修改！🤓🤓🤓🤓🤓🤓🤓🤓🤓🤓🤓

使用：

对相应的属性，进行设置！(数值、颜色)

self.navigationItem.rightBarButtonItem.badgeValue = [NSString stringWithFormat:@"%d",_numberOfMsgs];
self.navigationItem.rightBarButtonItem.badgeBGColor = RedAppColor;

效果：数值的判断

_numberOfMsgs = 0;

数值为 0：

_numberOfMsgs = 15;

数值在 正常范围：

_numberOfMsgs = 110;

数值 超过3位数：

（2017.11.03）

goyohol's essay