UIGraphics 绘制饼图
//
// YJPieModel.h
// 绘制饼图
//
// Created by pilgrim on 15/3/3.
// Copyright (c) 2015年 pilgrim. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface YJPieModel : NSObject
//饼图数据
@property (nonatomic, strong) NSNumber * number;
//饼图颜色
@property (nonatomic, strong) UIColor * color;
//饼图标注
@property (nonatomic, copy) NSString * title;
//量词
@property (nonatomic, copy) NSString * quantifier;
//工厂方法
- (instancetype)initWithNumber:(NSNumber *)number color:(UIColor *)color title:(NSString *)title quantifier:(NSString *)quantifier;
+ (instancetype)YJPieModelWithNumber:(NSNumber *)number color:(UIColor *)color title:(NSString *)title quantifier:(NSString *)quantifier;
@end
//
// YJPieModel.m
// 绘制饼图
//
// Created by pilgrim on 15/3/3.
// Copyright (c) 2015年 pilgrim. All rights reserved.
//
#import "YJPieModel.h"
@implementation YJPieModel
- (instancetype)initWithNumber:(NSNumber *)number color:(UIColor *)color title:(NSString *)title quantifier:(NSString *)quantifier
{
if (self = [super init]) {
_number = number;
_color = color;
_title = title;
_quantifier = quantifier;
}
return self;
}
+ (instancetype)YJPieModelWithNumber:(NSNumber *)number color:(UIColor *)color title:(NSString *)title quantifier:(NSString *)quantifier
{
return [[self alloc] initWithNumber:number color:color title:title quantifier:quantifier];
}
@end
//
// YJPieView.h
// 绘制饼图
//
// Created by pilgrim on 14-7-13.
// Copyright (c) 2014年 pilgrim. All rights reserved.
//
#import <UIKit/UIKit.h>
#import "YJPieModel.h"
@interface YJPieView : UIView
//饼图数据模型数组
@property (nonatomic, strong) NSArray * arrModel;
@end
//
// YJPieView.m
// 绘制饼图
//
// Created by pilgrim on 14-7-13.
// Copyright (c) 2014年 pilgrim. All rights reserved.
//
#import "YJPieView.h"
#import <math.h>
#import "NSString+YJString.h"
@implementation YJPieView
- (void)drawRect:(CGRect)rect
{
//判断是否有数据，如果没有，不再继续进行
if (self.arrModel.count == 0)
{
NSLog(@"饼图数据缺失。");
return;
}
//计算数据总量
CGFloat totalNumber = 0.0;
for (YJPieModel * model in self.arrModel)
{
totalNumber = totalNumber + model.number.integerValue;
}
//开启上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
//计算原点，半径，开始角度
CGPoint center = CGPointMake(rect.size.width / 2, rect.size.height / 2);
CGFloat r = 65;
CGFloat startAngle = 0;
int i = 0;
for (YJPieModel * model in self.arrModel)
{
if (model.number.integerValue <= 0) {
continue;
}
//计算结束角度
CGFloat endAngle = startAngle + model.number.integerValue / totalNumber * 2 * M_PI;
//贝塞尔路径画圆弧
UIBezierPath * path = [UIBezierPath bezierPathWithArcCenter:center radius:r startAngle:startAngle endAngle:endAngle clockwise:YES];
//添加到原点的线
[path addLineToPoint:center];
//封闭路径
[path closePath];
//将路径添加到上下文中
CGContextAddPath(ctx, path.CGPath);
//设置颜色
UIColor * color;
if (model.number.integerValue == 0)
{
color = [UIColor clearColor];
}else
{
color = model.color;
}
[color set];
//画图，填充模式
CGContextDrawPath(ctx, kCGPathFill);
CGContextSetLineWidth(ctx, 1.0);
CGContextSetStrokeColorWithColor(ctx, model.color.CGColor);
CGContextMoveToPoint(ctx, center.x, center.y);
CGFloat x = center.x + (10 + r) * cos(endAngle - (endAngle - startAngle) / 2);
CGFloat y = center.y + (10 + r) * sin(endAngle - (endAngle - startAngle) / 2);
CGContextAddLineToPoint(ctx, x, y);
CGFloat landLineX;
if (endAngle - (endAngle - startAngle) / 2 > M_PI_2 && endAngle - (endAngle - startAngle) / 2 < 3 * M_PI_2) {
landLineX = x - 5;
}else
{
landLineX = x + 5;
}
CGContextAddLineToPoint(ctx, landLineX, y);
CGContextStrokePath(ctx);
NSString * titleStr = [NSString stringWithFormat:@"%@%@%@", model.title, model.number, model.quantifier];
if (endAngle - (endAngle - startAngle) / 2 > M_PI_2 && endAngle - (endAngle - startAngle) / 2 < 3 * M_PI_2) {
CGSize titleStrSize = [NSString sizeWithText:titleStr font:[UIFont systemFontOfSize:12.0] maxSize:CGSizeMake(MAXFLOAT, 14)];
[titleStr drawAtPoint:CGPointMake(landLineX - titleStrSize.width, y - 7) withAttributes : @{NSFontAttributeName: [UIFont systemFontOfSize:12.0], NSForegroundColorAttributeName:model.color}];
}else
{
[titleStr drawAtPoint:CGPointMake(landLineX, y - 7) withAttributes : @{NSFontAttributeName: [UIFont systemFontOfSize:12.0], NSForegroundColorAttributeName:model.color}];
}
startAngle = endAngle;
//画文字
// CGPoint textPoint;
// if (startAngle < M_PI_2 || startAngle > 3 * M_PI_2) {
// textPoint = CGPointMake(<#CGFloat x#>, <#CGFloat y#>)
// }
// model.number.stringValue drawAtPoint:CGPointMake(<#CGFloat x#>, <#CGFloat y#>) withAttributes:@{NSFontAttributeName: [UIFont systemFontOfSize:12.0], NSForegroundColorAttributeName:[UIColor whiteColor]}
i ++;
// //添加标注
// UILabel * lblTitle = [[UILabel alloc] initWithFrame:CGRectMake(100, rect.size.width + 30 * i, 100, 30)];
// lblTitle.textColor = [UIColor blackColor];
// lblTitle.font = [UIFont systemFontOfSize:15];
// lblTitle.backgroundColor = [UIColor whiteColor];
// lblTitle.text = [NSString stringWithFormat:@"%@%@次", model.title, model.number];
// [self addSubview:lblTitle];
//
// //添加标注色块
// UIView * vColor = [[UIView alloc] initWithFrame:CGRectMake(65, rect.size.width + 30 * i + 5, 20, 20)];
// vColor.backgroundColor = model.color;
// [self addSubview:vColor];
}
}
#pragma mark - 懒加载
- (void)setArrModel:(NSArray *)arrModel
{
_arrModel = arrModel;
[self setNeedsDisplay];
}
@end