iOS实现自定义购物车角标显示购物数量（添加商品时角标抖动 Vie）
时间：2021-06-08 07:45:12 | 栏目：iOS代码 | 点击：次
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。