iOS验证码倒计时按钮

jopen 9年前

注:验证码倒计时按钮的应用是非常普遍的,该Blog就和你一起来写一个IDCountDownButton来实现验证码倒计时的效果。你可以想使用普通的UIButton类型按钮一样,只需要设置其倒计时时长(若未设置,默认为60秒),就可以轻松的实现点击countDownButton开始倒计时,倒计时结束方可重新点击。

实现效果

  • 如图

实现思路

  • 自定义一个IDCountDownButton,重写 beginTrackingWithTouch:withEvent: 拦截button的点击事件,根据是否正在倒计时决定是否响应并传递button的点击事件(若倒计时正在进行中,再次点击不会重新开始倒计时)
  • 是用NSTimer定时器,定时改变IDCountDownButton的title
  • 若倒计时结束,取消定时器并回复倒计时时长(使IDCountDownButton具备再次开始倒计时的能力)
  • 在IDCountDownButton销毁时,同样取消定时器

实现步骤

  • 添加相关的属性
    • 公有属性(public)

      @interface IDCountDownButton : UIButton  /** 验证码倒计时的时长 */  @property (nonatomic, assign) NSInteger durationOfCountDown;  @end
    • 私有属性

      @interface IDCountDownButton ()  /** 保存倒计时按钮的非倒计时状态的title */  @property (nonatomic, copy) NSString *originalTitle;  /** 保存倒计时的时长 */  @property (nonatomic, assign) NSInteger tempDurationOfCountDown;  /** 定时器对象 */  @property (nonatomic, strong) NSTimer *countDownTimer;  @end
  • 重写setter
    • title属性的setter
      • 私有属性originalTitle用来暂存开始计时前button的标题,即用户设置的button的标题,通常是“获取验证码”
      • 需要屏蔽计时过程中,title更新时改变originalTitle的值

        - (void)setTitle:(NSString *)title forState:(UIControlState)state {      [super setTitle:title forState:state];      // 倒计时过程中title的改变不更新originalTitle      if (self.tempDurationOfCountDown == self.durationOfCountDown) {          self.originalTitle = title;      }  }
    • durationOfCountDown属性的setter
      • 设置tempDurationOfCountDown的值
      • tempDurationOfCountDown的作用:倒计时;与durationOfCountDown配合判断当前IDCountDownButton是否具备重新开始倒计时的能力

        - (void)setDurationOfCountDown:(NSInteger)durationOfCountDown {      _durationOfCountDown = durationOfCountDown;      self.tempDurationOfCountDown = _durationOfCountDown;  }
  • 初始化
    • 设置倒计时的默认时长为60妙
    • 设置IDCountDownButton默认的title为“获取验证码”

      - (instancetype)initWithFrame:(CGRect)frame {      if (self = [super initWithFrame:frame]) {          // 设置默认的倒计时时长为60秒          self.durationOfCountDown = 60;          // 设置button的默认标题为“获取验证码”          [self setTitle:@"获取验证码" forState:UIControlStateNormal];      }      return self;  }  - (instancetype)initWithCoder:(NSCoder *)aDecoder {      if (self = [super initWithCoder:aDecoder]) {          // 设置默认的倒计时时长为60秒          self.durationOfCountDown = 60;          // 设置button的默认标题为“获取验证码”          [self setTitle:@"获取验证码" forState:UIControlStateNormal];      }      return self;  }
  • 拦截IDCountDownButton的点击事件,判断是否开始倒计时
    • 若tempDurationOfCountDown等于durationOfCountDown,说明未开始倒计时,响应并传递IDCountDownButton的点击事件;否则,不响应且不传递。

      - (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {      // 若正在倒计时,不响应点击事件      if (self.tempDurationOfCountDown != self.durationOfCountDown) {          return NO;      }      // 若未开始倒计时,响应并传递点击事件,开始倒计时      [self startCountDown];      return [super beginTrackingWithTouch:touch withEvent:event];  }
  • 倒计时
    • 创建定时器,开始倒计时

      - (void)startCountDown {      // 创建定时器      self.countDownTimer = [NSTimer timerWithTimeInterval:1 target:self selector:@selector(updateIDCountDownButtonTitle) userInfo:nil repeats:YES];      // 将定时器添加到当前的RunLoop中(自动开启定时器)      [[NSRunLoop currentRunLoop] addTimer:self.countDownTimer forMode:NSRunLoopCommonModes];  }
    • 更新IDCountDownButton的title为倒计时剩余的时间

      - (void)updateIDCountDownButtonTitle {      if (self.tempDurationOfCountDown == 0) {          // 设置IDCountDownButton的title为开始倒计时前的title          [self setTitle:self.originalTitle forState:UIControlStateNormal];          // 恢复IDCountDownButton开始倒计时的能力          self.tempDurationOfCountDown = self.durationOfCountDown;          [self.countDownTimer invalidate];      } else {          // 设置IDCountDownButton的title为当前倒计时剩余的时间          [self setTitle:[NSString stringWithFormat:@"%zd秒", self.tempDurationOfCountDown--] forState:UIControlStateNormal];      }  }
    • 移除定时器

      - (void)dealloc {      [self.countDownTimer invalidate];  }
  • 使用示例
    • 添加vertificationCodeIDCountDownButton属性

      @interface ViewController ()  /** 验证码倒计时的button */  @property (nonatomic, strong) IDCountDownButton *vertificationCodeIDCountDownButton;  @end
    • 创建vertificationCodeIDCountDownButton并进行相关设置

      - (void)viewDidLoad {      [super viewDidLoad];      // 创建vertificationCodeIDCountDownButton      self.vertificationCodeIDCountDownButton = [[IDCountDownButton alloc] initWithFrame:CGRectMake(160, 204, 120, 44)];      // 添加点击事件      [self.vertificationCodeIDCountDownButton addTarget:self action:@selector(vertificationCodeIDCountDownButtonClick:) forControlEvents:UIControlEventTouchUpInside];      // 设置标题相关属性      [self.vertificationCodeIDCountDownButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];      [self.vertificationCodeIDCountDownButton setTitle:@"获取验证码" forState:UIControlStateNormal];      // 设置背景图片      [self.vertificationCodeIDCountDownButton setBackgroundImage:[UIImage imageNamed:@"redButton"] forState:UIControlStateNormal];      // 设置倒计时时长      self.vertificationCodeIDCountDownButton.durationOfCountDown = 10;      // 将vertificationCodeIDCountDownButton添加的控制器的view中      [self.view addSubview:self.vertificationCodeIDCountDownButton];  }
    • 实现点击事件触发的操作

      - (void)vertificationCodeIDCountDownButtonClick:(UIButton *)button {      // TODO:调用服务器接口,获取验证码  }

关于AppIcon

  • 添加AppIcon时需要遵循以下规则
    • 命名,以Icon开头(首字母大写), 跟上@2x/@3x ,如图:

    • 尺寸,必须按要求设置尺寸,如图

      • 图中所示的60pt对应的图片尺寸是:
        • 2x:120px X 120px
        • 3x:180px X 180px

来自: http://www.cnblogs.com/theDesertIslandOutOfTheWorld/p/5115513.html