iOS－柱状图

//
//  HMPieView.m
//  饼图
//
//  Created by YaguangZhu on 15/9/9.
//  Copyright (c) 2015年 YaguangZhu. All rights reserved.
//

#import "HMPieView.h"
#import "UIColor+Random.h"

@implementation HMPieView

// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code

NSArray *data = @[@25,@25,@50];
int count = data.count;

CGFloat w = rect.size.width/(2*count -1);
CGFloat h =0;
CGFloat x =0;
CGFloat y =0;
CGFloat viewH = rect.size.height;
CGContextRef ctx = UIGraphicsGetCurrentContext();

for (int i  = 0 ; i< count; i++) {
h = viewH * [data[i] intValue]/100.0;
x= 2 * w * i;
y= viewH - h;
UIBezierPath *path = [UIBezierPath bezierPathWithRect:CGRectMake(x, y, w, h)];
CGContextAddPath(ctx, path.CGPath);

[[UIColor randomColor]set];
CGContextFillPath(ctx);

}

}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self setNeedsDisplay];
}

@end