iOS使用UICountingLabel实现数字变化的动画效果
VicTQUP
8年前
<p>一、下载UICountingLabel</p> <p>下载地址: <a href="/misc/goto?guid=4959674314898728032">https://github.com/dataxpress/UICountingLabel</a><br> 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!</p> <p>二、使用UICountingLabel</p> <p>1. 初始化</p> <p>UICountingLabel 继承 UILabel, 初始化和 UILabel 一样, 如下:</p> <pre> <code class="language-objectivec">UICountingLabel* myLabel = [[UICountingLabel alloc] initWithFrame:CGRectMake(10, 10, 100, 40)]; [self.view addSubview:myLabel];</code></pre> <p>2. 设置文本样式</p> <p>可以这样设置:</p> <pre> <code class="language-objectivec">myLabel.format = @"%d";</code></pre> <p>也可以使用 block设置:</p> <pre> <code class="language-objectivec">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]; } };</code></pre> <p>3. 设置变化范围及动画时间</p> <pre> <code class="language-objectivec">[myLabel countFrom:50 to:100 withDuration:5.0f];</code></pre> <p>就这么简单!</p> <p>三、实例效果</p> <p>1. 整数样式数字的变化</p> <p>代码如下:</p> <pre> <code class="language-objectivec">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];</code></pre> <p>效果图如下:</p> <p><img src="https://simg.open-open.com/show/4bd0d726e7709d8b1394eec7bbd727d3.gif" alt="iOS使用UICountingLabel实现数字变化的动画效果" width="458" height="168"></p> <p>整数样式</p> <p>2. 浮点数样式数字的变化</p> <p>代码如下:</p> <pre> <code class="language-objectivec">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];</code></pre> <p>效果图如下:</p> <p><img src="https://simg.open-open.com/show/a0857023b58061c313d14e5d1ae4936e.gif" alt="iOS使用UICountingLabel实现数字变化的动画效果" width="458" height="168"></p> <p>浮点数样式</p> <p>3. 带有千分位分隔符的浮点数样式</p> <p>由于UICountingLabel没有这种样式, 所以稍微需要修改一下UICountingLabel文件.<br> 首先在<code>UICountingLabel.h</code>头文件中增加一个属性, 如下图:</p> <p><img src="https://simg.open-open.com/show/ed1bd8c40dea970450eaeccba4d8880a.png" alt="iOS使用UICountingLabel实现数字变化的动画效果" width="990" height="116"></p> <p>添加<code>positiveFormat</code>属性</p> <p><br> 接着在<code>UICountingLabel.m</code>文件里面<code>- (void)setTextValue:(CGFloat)value</code>方法中添加如下代码:</p> <p><img src="https://simg.open-open.com/show/8415d3a6ff7b382eabdba73854c8bf90.png" alt="iOS使用UICountingLabel实现数字变化的动画效果" width="1153" height="466"></p> <p>添加此段代码</p> <p>这样UICountingLabel就可以实现这种样式了.<br> <br> 下面开始实现这种样式, 代码如下:</p> <pre> <code class="language-objectivec">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"; //设置分隔符样式 myLabel.positiveFormat = @"###,##0.00"; //设置变化范围及动画时间 [self.myLabel countFrom:0.00 to:3048.64 withDuration:1.0f];</code></pre> <p>效果图如下:</p> <p><img src="https://simg.open-open.com/show/e957a0c3027fc2a13392158eb3465201.gif" alt="iOS使用UICountingLabel实现数字变化的动画效果" width="458" height="168"></p> <p>带有千分位分隔符的浮点数</p> <p><br> </p> <p>文／<a href="/misc/goto?guid=4959674315037801935">jianshu_wl</a>（简书）<br> </p> <p> </p> <p> </p>