iOS实现自定义购物车角标显示购物数量（添加商

前言：

适用场景：商城类的 App 。将自定义的购物车 view 设置为 navigationItem 的导航栏按钮。效果图如下：

图1、右上角的购物车即是我们定义的view

实现原理：

1、利用 navigationItem 可以将 UIView 设置为导航栏的按钮；

2、将一个 UIButton 和 一个 UILabel 添加到一个 UIView 上。然后将这个 UIView 设置为 navigationItem 的右侧按钮；3、UILabel 控件的动画效果。

具体实现代码如下：​

​1、ShopCarView.h 文件

#import
@protocol ShopCarButtonDelegate <</span>NSObject>
// 代理的方法，在此方法内，完成按钮的点击事件。
- (void)shopCarButtonClickAction;
@end
@interfaceShopCarView : UIView
@property (nonatomic, assign)id<</span>ShopCarButtonDelegate> delegate;
// 为购物车设置角标内数值
- (void)setShopCarCount:(NSString *)count;
@end

2、ShopCarView.m 文件

​#import "ShopCarView.h"
@interfaceShopCarView()
@property (nonatomic, strong)UIButton *carButton;
@property (nonatomic, strong)UILabel *countLabel;
@end
@implementation ShopCarView
- (instancetype)initWithFrame:(CGRect)frame{
 CGRect myFrame = CGRectMake(0, 0, 40, 40);
 self = [superinitWithFrame:myFrame];
 if (self) {
 [selfaddSubview:self.carButton];
 }
 returnself;
}
- (UIButton *)carButton{
 if (!_carButton) {
 _carButton = [UIButtonbuttonWithType:UIButtonTypeCustom];
 _carButton.frame = CGRectMake(0, 8, 32, 32);
 [_carButtonsetImage:[UIImageimageNamed:@"购物1"] forState:UIControlStateNormal];
 [_carButtonaddTarget:selfaction:@selector(shopCarButtonAction) forControlEvents:UIControlEventTouchUpInside];
 }
 return_carButton;
}
- (UILabel *)countLabel{
 if (!_countLabel) {
 _countLabel = [[UILabelalloc] initWithFrame:CGRectMake(24, 5, 16, 16)];
 _countLabel.backgroundColor = [UIColorredColor];
 _countLabel.textAlignment = NSTextAlignmentCenter;
 _countLabel.textColor = [UIColorwhiteColor];
 _countLabel.layer.cornerRadius = 8;
 _countLabel.font = [UIFontsystemFontOfSize:12];
 _countLabel.layer.masksToBounds = YES;
 [selfaddSubview:_countLabel];
 }
 return_countLabel;
}
// 为购物车设置角标内数值
- (void)setShopCarCount:(NSString *)count{
 if ([count integerValue] == 0) {
 if (_countLabel) {
  [_countLabelremoveFromSuperview];
  _countLabel = nil;
 }
 return;
 }
 if ([count integerValue] > 9) {
 self.countLabel.text = @"9+";
 }else{
 self.countLabel.text = count;
 }
 [selfshakeView:_countLabel];
}
// 实现的代理方法
- (void)shopCarButtonAction{
 [self.delegateshopCarButtonClickAction];
}
// 实现抖动效果
-(void)shakeView:(UIView*)viewToShake
{
 CGFloat t =2.0;
 CGAffineTransform translateRight =CGAffineTransformTranslate(CGAffineTransformIdentity, t,0.0);
 CGAffineTransform translateLeft =CGAffineTransformTranslate(CGAffineTransformIdentity,-t,0.0);
 viewToShake.transform = translateLeft;
[UIViewanimateWithDuration:0.07delay:0.0options:UIViewAnimationOptionAutoreverse|UIViewAnimationOptionRepeatanimations:^{
 [UIViewsetAnimationRepeatCount:2.0];
 viewToShake.transform = translateRight;
 } completion:^(BOOL finished){
 if(finished){
[UIViewanimateWithDuration:0.05delay:0.0options:UIViewAnimationOptionBeginFromCurrentStateanimations:^{
  viewToShake.transform =CGAffineTransformIdentity;
  } completion:NULL];
 }
 }];
}
@end

​代码很简单，逻辑也比较清晰。使用代理方法，将自定义的 View 的属性隐藏起来，打到很好的封装效果。

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