在大多数金融类 app 上或者其他 app 需要数字展示的地方, 经常会有如下的动画效果:
动画效果
怎么做呢?
一、下载UICountingLabel
UICountingLabel只支持整形和浮点数样式, 像大部分金融类app里面显示的金额(带有千分位分隔符)的样式是无法显示的, 但是后面会给出解决方案, 实现这些的效果!
二、使用UICountingLabel
1. 初始化
UICountingLabel 继承 UILabel, 初始化和 UILabel 一样, 如下:
UICountingLabel* myLabel = [[UICountingLabel alloc] initWithFrame:CGRectMake(10, 10, 100, 40)];
[self.view addSubview:myLabel];
2. 设置文本样式
可以这样设置:
myLabel.format = @"%d";
也可以使用 block设置:
myLabel.formatBlock = ^NSString* (CGFloat value) {
NSInteger years = value / 12;
NSInteger months = (NSInteger)value % 12;
if (years == 0) {
return [NSString stringWithFormat: @"%ld months", (long)months];
}
else {
return [NSString stringWithFormat: @"%ld years, %ld months", (long)years, (long)months];
}
};
3. 设置变化范围及动画时间
[myLabel countFrom:50 to:100 withDuration:5.0f];
就这么简单!
三、实例效果
1. 整数样式数字的变化
UICountingLabel *myLabel = [[UICountingLabel alloc] initWithFrame:CGRectMake(20, CGRectGetMaxY(titleLabel.frame)+1, 280, 45)];
myLabel.textAlignment = NSTextAlignmentCenter;
myLabel.font = [UIFont fontWithName:@"Avenir Next" size:48];
myLabel.textColor = [UIColor colorWithRed:236/255.0 green:66/255.0 blue:43/255.0 alpha:1];
[self.view addSubview:myLabel];
//设置格式
myLabel.format = @"%d";
//设置变化范围及动画时间
[self.myLabel countFrom:0
to:100
withDuration:1.0f];
效果图如下:
整数样式
2. 浮点数样式数字的变化
UICountingLabel *myLabel = [[UICountingLabel alloc] initWithFrame:CGRectMake(20, CGRectGetMaxY(titleLabel.frame)+1, 280, 45)];
myLabel.textAlignment = NSTextAlignmentCenter;
myLabel.font = [UIFont fontWithName:@"Avenir Next" size:48];
myLabel.textColor = [UIColor colorWithRed:236/255.0 green:66/255.0 blue:43/255.0 alpha:1];
[self.view addSubview:myLabel];
//设置格式
myLabel.format = @"%.2f";
//设置变化范围及动画时间
[self.myLabel countFrom:0.00
to:3198.23
withDuration:1.0f];
