金额跳动动画效果

前言

金额效果，由于觉得公司目前的金额太乏味，决定加点效果，也特此写了个小demo，代码非常简单，贴代码方便大家看看

通过 runtime 建立属性(setter/getter方法)

/** 因为分类中要增加属性，所以通过runtime方法来实现 */- (void)setAnimatedNumber:(NSNumber *)animatedNumber {    objc_setAssociatedObject(self, "animatedNumber", animatedNumber, OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (NSNumber *)animatedNumber {    return objc_getAssociatedObject(self, "animatedNumber");}- (void)setTimer:(NSTimer *)timer {    objc_setAssociatedObject(self, "timer", timer, OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (NSTimer *)timer {    return objc_getAssociatedObject(self, "timer");}- (void)setValueString:(NSString *)valueString {    objc_setAssociatedObject(self, "valueString", valueString, OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (NSString *)valueString {    return objc_getAssociatedObject(self, "valueString");}

变量初始化以及定时器

- (void)dw_setNumber:(NSNumber *)number {    [self dw_setNumber:number duration:5.0];  //这里，我写5秒，是为了方便我录gif，用中可以改为1或者者2}

显示金额动画

- (void)changeAnimation:(NSTimer *)timer{    NSMutableDictionary *info = timer.userInfo;    int begin = (int)[info objectForKey:kBeginNumberKey];    int end = ((NSNumber *)[info objectForKey:kEndNumberKey]).intValue;    int range = ((NSNumber *)[info objectForKey:kRangeNumberKey]).intValue;        NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];    [formatter setNumberStyle:NSNumberFormatterNoStyle];    [formatter setFormatWidth:9];    [formatter setPositiveFormat:@",##0.00"];    int value = self.valueString.intValue;        if (value == 0) {        self.valueString = [NSString stringWithFormat:@"%d", begin];        self.text = [NSString stringWithFormat:@"%.@",[formatter stringFromNumber:@(begin)]];    } else if (value >= end) {        self.text = [NSString stringWithFormat:@"%.@",[formatter stringFromNumber:@(end)]];        [self.timer invalidate];        self.timer = nil;        return;    } else {        value += range;        self.valueString = [NSString stringWithFormat:@"%d", value];        self.text = [NSString stringWithFormat:@"%.@",[formatter stringFromNumber:@(value)]];            }    }