HUChart 介绍
HUChart是一个简单的（但是是第一个）ios的绘制半圆圈图（半饼图）表的工具。绘制半圆图表是为了在某些情况下，用一个小空间去完成一个完整的圆图。
相关特性：
- 半圆图表绘制工具就像一个 UIView 的组件. 可以不费一点力气绘制一个定制的半圆图表。
- 支持 iOS 6.1以上的版本
- 支持ARC
用法如下：
// Step 1: Create HUSemiCircleChart object with its desire frame
CGRect frame = CGRectMake(25, 30, 250, 300);
HUSemiCircleChart *semiCircleChart = [[HUSemiCircleChart alloc]
initWithFrame:frame];
// Step 2: Setup data
NSMutableArray *data = [NSMutableArray arrayWithObjects:
[[HUChartEntry alloc]initWithName:@"Chrome" value:@54.1],
[[HUChartEntry alloc]initWithName:@"Firefox" value:@27.2],
[[HUChartEntry alloc]initWithName:@"IE" value:@11.7],
[[HUChartEntry alloc]initWithName:@"Safari" value:@3.8],
[[HUChartEntry alloc]initWithName:@"Others" value:@3.2],
nil];
[semiCircleChart setData:data];
// Step 3: Setup color (Optional)
// colors maybe not setup, will be generated automatically
UIColor * color1 = [UIColor colorWithRed:1.0 green:0.0 blue:0.0 alpha:1.0];
UIColor * color2 = [UIColor colorWithRed:0.0 green:1.0 blue:0.0 alpha:1.0];
UIColor * color3 = [UIColor colorWithRed:0.0 green:0.5 blue:0.0 alpha:1.0];
UIColor * color4 = [UIColor colorWithRed:1.0 green:0.0 blue:1.0 alpha:1.0];
UIColor * color5 = [UIColor colorWithRed:0.0 green:0.0 blue:1.0 alpha:1.0];
NSMutableArray *colors = [NSMutableArray arrayWithObjects: color1, color2,
color3, color4,
color5, nil];
[semiCircleChart setColors:colors];
// Step 4: Setup Chart Title
[semiCircleChart setTitle:@"Browser Shared"];
// Step 5: Determine whether chart element text is shown or not.
// SHOW_PORTION_TEXT to show element's name
// SHOW_PORTION_VALUE to show element's value
// DONT_SHOW_PORTION to show element without any text
semiCircleChart.showPortionTextType = SHOW_PORTION_TEXT;