简介
UIBarButtonItem 默认是不能 设置 Badge 所以我们可以对它扩展使之支持
实现方法
添加如下代码
UIBarButtonItem Badge.h
代码语言：javascript复制#import <UIKit/UIKit.h>
@interface UIBarButtonItem (Badge)
@property (strong, nonatomic) UILabel *badge;
// 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;
@endUIBarButtonItem Badge.m
代码语言：javascript复制#import <objc/runtime.h>
#import "UIBarButtonItem Badge.h"
NSString const *badgeKey = @"badgeKey";
NSString const *badgeBGColorKey = @"badgeBGColorKey";
NSString const *badgeTextColorKey = @"badgeTextColorKey";
NSString const *badgeFontKey = @"badgeFontKey";
NSString const *badgePaddingKey = @"badgePaddingKey";
NSString const *badgeMinSizeKey = @"badgeMinSizeKey";
NSString const *badgeOriginXKey = @"badgeOriginXKey";
NSString const *badgeOriginYKey = @"badgeOriginYKey";
NSString const *shouldHideBadgeAtZeroKey = @"shouldHideBadgeAtZeroKey";
NSString const *shouldAnimateBadgeKey = @"shouldAnimateBadgeKey";
NSString const *badgeValueKey = @"badgeValueKey";
@implementation UIBarButtonItem (Badge)
@dynamic badgeValue, badgeBGColor, badgeTextColor, badgeFont;
@dynamic badgePadding, badgeMinSize, badgeOriginX, badgeOriginY;
@dynamic shouldHideBadgeAtZero, shouldAnimateBadge;
- (void)badgeInit
{
// Default design initialization
self.badgeBGColor = [UIColor redColor];
self.badgeTextColor = [UIColor whiteColor];
self.badgeFont = [UIFont systemFontOfSize:10.0];
self.badgePadding = 4;
self.badgeMinSize = 6;
self.badgeOriginX = self.customView.frame.size.width - self.badge.frame.size.width/2;
self.badgeOriginY = -6;
self.shouldHideBadgeAtZero = YES;
self.shouldAnimateBadge = YES;
// Avoids badge to be clipped when animating its scale
self.customView.clipsToBounds = NO;
}
#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;
}
- (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.frame = CGRectMake(self.badgeOriginX, self.badgeOriginY, minWidth padding, minHeight padding);
self.badge.layer.cornerRadius = (minHeight padding) / 2;
self.badge.layer.masksToBounds = YES;
}
// 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
NSTimeInterval duration = animated ? 0.2 : 0;
[UIView animateWithDuration:duration animations:^{
[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 {
return objc_getAssociatedObject(self, &badgeKey);
}
-(void)setBadge:(UILabel *)badgeLabel
{
objc_setAssociatedObject(self, &badgeKey, badgeLabel, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
// Badge value to be display
-(NSString *)badgeValue {
return objc_getAssociatedObject(self, &badgeValueKey);
}
-(void) setBadgeValue:(NSString *)badgeValue
{
objc_setAssociatedObject(self, &badgeValueKey, badgeValue, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
// When changing the badge value check if we need to remove the badge
if (!badgeValue || [badgeValue isEqualToString:@""] || ([badgeValue isEqualToString:@"0"] && self.shouldHideBadgeAtZero)) {
[self removeBadge];
} else if (!self.badge) {
// Create a new badge because not existing
self.badge = [[UILabel alloc] initWithFrame:CGRectMake(self.badgeOriginX, self.badgeOriginY, 20, 20)];
self.badge.textColor = self.badgeTextColor;
self.badge.backgroundColor = self.badgeBGColor;
self.badge.font = self.badgeFont;
self.badge.textAlignment = NSTextAlignmentCenter;
[self badgeInit];
[self.customView addSubview:self.badge];
[self updateBadgeValueAnimated:NO];
} else {
[self updateBadgeValueAnimated:YES];
}
}
// Badge background color
-(UIColor *)badgeBGColor {
return objc_getAssociatedObject(self, &badgeBGColorKey);
}
-(void)setBadgeBGColor:(UIColor *)badgeBGColor
{
objc_setAssociatedObject(self, &badgeBGColorKey, badgeBGColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
if (self.badge) {
[self refreshBadge];
}
}
// Badge text color
-(UIColor *)badgeTextColor {
return objc_getAssociatedObject(self, &badgeTextColorKey);
}
-(void)setBadgeTextColor:(UIColor *)badgeTextColor
{
objc_setAssociatedObject(self, &badgeTextColorKey, badgeTextColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
if (self.badge) {
[self refreshBadge];
}
}
// Badge font
-(UIFont *)badgeFont {
return objc_getAssociatedObject(self, &badgeFontKey);
}
-(void)setBadgeFont:(UIFont *)badgeFont
{
objc_setAssociatedObject(self, &badgeFontKey, badgeFont, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
if (self.badge) {
[self refreshBadge];
}
}
// Padding value for the badge
-(CGFloat) badgePadding {
NSNumber *number = objc_getAssociatedObject(self, &badgePaddingKey);
return number.floatValue;
}
-(void) setBadgePadding:(CGFloat)badgePadding
{
NSNumber *number = [NSNumber numberWithDouble:badgePadding];
objc_setAssociatedObject(self, &badgePaddingKey, number, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
if (self.badge) {
[self updateBadgeFrame];
}
}
// Minimum size badge to small
-(CGFloat) badgeMinSize {
NSNumber *number = objc_getAssociatedObject(self, &badgeMinSizeKey);
return number.floatValue;
}
-(void) setBadgeMinSize:(CGFloat)badgeMinSize
{
NSNumber *number = [NSNumber numberWithDouble:badgeMinSize];
objc_setAssociatedObject(self, &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, &badgeOriginXKey);
return number.floatValue;
}
-(void) setBadgeOriginX:(CGFloat)badgeOriginX
{
NSNumber *number = [NSNumber numberWithDouble:badgeOriginX];
objc_setAssociatedObject(self, &badgeOriginXKey, number, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
if (self.badge) {
[self updateBadgeFrame];
}
}
-(CGFloat) badgeOriginY {
NSNumber *number = objc_getAssociatedObject(self, &badgeOriginYKey);
return number.floatValue;
}
-(void) setBadgeOriginY:(CGFloat)badgeOriginY
{
NSNumber *number = [NSNumber numberWithDouble:badgeOriginY];
objc_setAssociatedObject(self, &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, &shouldHideBadgeAtZeroKey);
return number.boolValue;
}
- (void)setShouldHideBadgeAtZero:(BOOL)shouldHideBadgeAtZero
{
NSNumber *number = [NSNumber numberWithBool:shouldHideBadgeAtZero];
objc_setAssociatedObject(self, &shouldHideBadgeAtZeroKey, number, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
// Badge has a bounce animation when value changes
-(BOOL) shouldAnimateBadge {
NSNumber *number = objc_getAssociatedObject(self, &shouldAnimateBadgeKey);
return number.boolValue;
}
- (void)setShouldAnimateBadge:(BOOL)shouldAnimateBadge
{
NSNumber *number = [NSNumber numberWithBool:shouldAnimateBadge];
objc_setAssociatedObject(self, &shouldAnimateBadgeKey, number, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
@end调用方法
初始化
代码语言：javascript复制let rightBarButtonItemImage:UIImage! = UIImage(named: "tongzhi");
let button = UIButton(type: UIButtonType.Custom);
button.frame = CGRectMake(0,0,rightBarButtonItemImage.size.width, rightBarButtonItemImage.size.height);
button.setBackgroundImage(rightBarButtonItemImage, forState: UIControlState.Normal);
button.addTarget(self, action: #selector(MainViewController.tongzhiPressed(_:)), forControlEvents: UIControlEvents.TouchUpInside);
let navRightButton = UIBarButtonItem(customView: button);
navRightButton.badgeBGColor = UIColor.redColor();
navRightButton.badgeTextColor = UIColor.whiteColor();
self.navigationItem.rightBarButtonItem = navRightButton;设置值
代码语言：javascript复制self.navigationItem.rightBarButtonItem!.badgeValue = "2";设置隐藏
代码语言：javascript复制self.navigationItem.rightBarButtonItem!.badgeValue = "";其它组件
也可以用其它组件实现
比如的这个JSBadgeView
它可以在任何View上添加Badge
引用方式import JSBadgeView
调用方式
代码语言：javascript复制let badgeView = JSBadgeView(parentView: myview, alignment: JSBadgeViewAlignment.TopRight);
badgeView.badgeText = "3";
