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个人比较喜欢做笔记和写总结，毕竟好记性不如烂笔头哈哈，这些文章记录了我的IOS成长历程，希望能与大家一起进步
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目录

• 一、UICountingLabel
• Demo
• 参考文献

一、UICountingLabel

a、运行效果

UICountingLabel

b、做一个算数的

UICountingLabel *myLabel = [[UICountingLabel alloc] initWithFrame:CGRectMake(10, 100, 200, 40)];
myLabel.method = UILabelCountingMethodLinear;// 线性变化
myLabel.format = @"%d";
[self.view addSubview:myLabel];
[myLabel countFrom:1 to:10 withDuration:3.0];

c、使用ease-in-out（默认设置）将计数从5%增加到10%

UICountingLabel *countPercentageLabel = [[UICountingLabel alloc] initWithFrame:CGRectMake(10, 170, 200, 40)];
[self.view addSubview:countPercentageLabel];
countPercentageLabel.format = @"%.1f%%";
[countPercentageLabel countFrom:5 to:10];

d、使用使用数字格式化的字符串进行计数

UICountingLabel *scoreLabel = [[UICountingLabel alloc] initWithFrame:CGRectMake(10, 210, 200, 40)];
[self.view addSubview:scoreLabel];

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
formatter.numberStyle = kCFNumberFormatterDecimalStyle;

// 可以对显示的文本格式进行自定义
scoreLabel.formatBlock = ^NSString *(CGFloat value)
{
    NSString *formatted = [formatter stringFromNumber:@((int)value)];
    return [NSString stringWithFormat:@"Score: %@",formatted];
};
scoreLabel.method = UILabelCountingMethodEaseOut;// 开始速度很快，快结束时变得缓慢
[scoreLabel countFrom:0 to:10000 withDuration:2.5];// 可以指定动画的时长，默认时长是2.0秒

e、使用属性字符串计数

NSInteger toValue = 100;
UICountingLabel *attributedLabel = [[UICountingLabel alloc] initWithFrame:CGRectMake(10, 270, 200, 40)];
[self.view addSubview:attributedLabel];

// 用于设置属性字符串的格式，如果指定了formatBlock，则将会覆盖掉format属性，因为block的优先级更高
attributedLabel.attributedFormatBlock = ^NSAttributedString* (CGFloat value)
{
    NSDictionary *normal = @{ NSFontAttributeName: [UIFont fontWithName: @"HelveticaNeue-UltraLight" size: 20] };
    NSDictionary *highlight = @{ NSFontAttributeName: [UIFont fontWithName: @"HelveticaNeue" size: 20] };
    
    NSString *prefix = [NSString stringWithFormat:@"%d", (int)value];
    NSString *postfix = [NSString stringWithFormat:@"/%d", (int)toValue];
    
    NSMutableAttributedString *prefixAttr = [[NSMutableAttributedString alloc] initWithString: prefix attributes: highlight];
    NSAttributedString *postfixAttr = [[NSAttributedString alloc] initWithString: postfix attributes: normal];
    [prefixAttr appendAttributedString: postfixAttr];
    
    return prefixAttr;
};
[attributedLabel countFrom:0 to:toValue withDuration:2.5];

f、获得动画结束的事件

self.completionBlockLabel = [[UICountingLabel alloc] initWithFrame:CGRectMake(10, 370, 200, 40)];
[self.view addSubview:self.completionBlockLabel];
self.completionBlockLabel.method = UILabelCountingMethodEaseInOut;
self.completionBlockLabel.format = @"%d%%";

__weak UICountingLabelViewController *weakSelf = self;
self.completionBlockLabel.completionBlock = ^{
    weakSelf.completionBlockLabel.textColor = [UIColor colorWithRed:0 green:0.5 blue:0 alpha:1];
};
[self.completionBlockLabel countFrom:0 to:100];

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Demo

Demo在我的Github上，欢迎下载。
UseFrameworkDemo

参考文献