仿淘宝购物车计数器

我使用的Masonary布局，当然这里可以改成frame，很简单，新建CountView继承UIView,CreateUI这个类是我封装创建基础的UILabel，UIButton的，很简单的代码

/*
 项目新增数量计数器
 */
#import <UIKit/UIKit.h>
@interface CountView : UIView
//如果点击+或者-，把当前的计数传出去
@property(nonatomic,copy)void(^getNumber)(int number);
@end

 #import "CountView.h"#import "CreateUI.h"#import "Masonry.h"

#import "CountView.h"
#import "CreateUI.h"
//#import "DefineStr.h"
#import "Masonry.h"

#define BackColor @"#d6d6d6"
@interface CountView ()
@property(nonatomic,strong)UIButton *subBtn;
@property(nonatomic,strong)UILabel *numberLab;
@property(nonatomic,strong)UIButton *addBtn;
@end

@implementation CountView

-(instancetype)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if(self){
        //给当前View加圆角
        [CreateUI radiuCornerWithColor:self radius:3.0 colorStr:BackColor];
        //创建UIButton
        self.subBtn = [CreateUI createBtnWithTile:@"-" withTitleColorStr:@"#2a2a2a" withFontSize:12];
        [self addSubview:self.subBtn];
        //创建UILabel
        self.numberLab = [CreateUI createLabelWithTextColorStr:@"#2a2a2a" withFontSize:12 withText:@"0"];
        [self addSubview:self.numberLab];
        
        self.addBtn = [CreateUI createBtnWithTile:@"+" withTitleColorStr:@"#2a2a2a" withFontSize:12];
        [self addSubview:self.addBtn];
        
        
        [self.subBtn setTitleColor:[UIColor grayColor] forState:UIControlStateDisabled];
        [CreateUI addFrameWithRightView:self.subBtn borderWidth:1.0f withBorderColor:BackColor];
        [CreateUI addFrameWithRightView:self.numberLab borderWidth:1.0f withBorderColor:BackColor];
        [self.addBtn setTitleColor:[UIColor grayColor] forState:UIControlStateDisabled];
        
        [self.subBtn setEnabled:NO];
        [self.subBtn mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.top.bottom.offset(0);
            make.width.equalTo(self.mas_width).multipliedBy(2/7.0);
        }];
        self.numberLab.textAlignment = NSTextAlignmentCenter;
        [self.numberLab mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.equalTo(self.subBtn.mas_right);
            make.top.bottom.offset(0);
            make.right.equalTo(self.addBtn.mas_left);
        }];
        [self.addBtn mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.equalTo(self.subBtn.mas_right);
            make.top.bottom.right.offset(0);
            make.width.equalTo(self.subBtn.mas_width);
        }];
        
        
        [self.subBtn addTarget:self action:@selector(subBtnClick) forControlEvents:UIControlEventTouchUpInside];
        [self.addBtn addTarget:self action:@selector(addBtnClick) forControlEvents:UIControlEventTouchUpInside];
        
    }
    return self;
}
//点击-号事件
-(void)subBtnClick{
    int number = [self.numberLab.text intValue]-1;
    self.numberLab.text = [NSString stringWithFormat:@"%d",number];
    //如果已经是0了，则-号不能点击
    if([self.numberLab.text intValue] == 0){
        [self.subBtn setEnabled:NO];
    }
    if(self.getNumber){
        self.getNumber(number);
    }
}
//点击+号事件
-(void)addBtnClick{
    int number = [self.numberLab.text intValue]+1;
    self.numberLab.text = [NSString stringWithFormat:@"%d",number];
    //如果-号不能点击，当前计数大于0，则-号UIButton可点击
    if(![self.subBtn isEnabled]){
        [self.subBtn setEnabled:YES];
    }
    if(self.getNumber){
        self.getNumber(number);
    }
}

@end

 

使用：

CountView *view = [CountView new];
    [self.view addSubview:view];
    
    [view mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.offset(500);
        make.left.offset(100);
        make.width.offset(100);
        make.height.offset(50);
    }];
    view.getNumber = ^(int number) {
        NSLog(@"----:%d",number);
    };