//类似于支付宝余额的动态显示
@property (nonatomic, assign) float balance;

- (void)dealloc {

    //释放定时器

    [_balanceLabelAnimationTimer invalidate];

     _balanceLabelAnimationTimer = nil;

}

- (void)setBalance:(float)balance {        _balance = balance;    [self setNumberTextOfLabel:self.moneyLab WithAnimationForValueContent:balance];      }#pragma mark --- 余额支付的动画----- (void)setNumberTextOfLabel:(UILabel *)label WithAnimationForValueContent:(CGFloat)value{    CGFloat lastValue = [label.text floatValue];    CGFloat delta = value - lastValue;    if (delta == 0) {           label.text = @"0.00";        return;    }       if (delta > 0) {                CGFloat ratio = value / 60.0;                NSDictionary *userInfo = @{@"label" : label,                                   @"value" : @(value),                                   @"ratio" : @(ratio)                                   };        _balanceLabelAnimationTimer = [NSTimer scheduledTimerWithTimeInterval:0.02 target:self selector:@selector(setupLabel:) userInfo:userInfo repeats:YES];        [[NSRunLoop currentRunLoop] addTimer:_balanceLabelAnimationTimer forMode:NSRunLoopCommonModes];    }}- (void)setupLabel:(NSTimer *)timer{    NSDictionary *userInfo = timer.userInfo;    UILabel *label = userInfo[@"label"];    CGFloat value = [userInfo[@"value"] floatValue];    CGFloat ratio = [userInfo[@"ratio"] floatValue];        static int flag = 1;    CGFloat lastValue = [label.text floatValue];    CGFloat randomDelta = (arc4random_uniform(2) + 1) * ratio;    CGFloat resValue = lastValue + randomDelta;        if ((resValue >= value) || (flag == 50)) {        label.text = [NSString stringWithFormat:@"%.2f", value];        flag = 1;        [timer invalidate];        timer = nil;        return;    } else {        label.text = [NSString stringWithFormat:@"%.2f", resValue];    }        flag++;    }