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效果:
1 先自定义一个view
#import <UIKit/UIKit.h>
#define kCalloutWidth 80.0 //气泡高度
#define kCalloutHeight 95.0 //气泡宽度
#define kArrorHeight 15 //底部距离高度
@interface CallOutContentView : UIView
@end
2实现代码
#import "CallOutContentView.h"
@implementation CallOutContentView
- (instancetype)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
self.backgroundColor = [UIColor clearColor];
}
return self;
}
#pragma mark - draw rect
- (void)drawRect:(CGRect)rect{
[self drawInContext:UIGraphicsGetCurrentContext()];
self.layer.shadowColor = [[UIColor clearColor] CGColor];
self.layer.shadowOpacity = 1.0;
self.layer.shadowOffset = CGSizeMake(0.0f, 0.0f);
}
- (void)drawInContext:(CGContextRef)context
{
CGContextSetLineWidth(context, 2.0);
CGContextSetFillColorWithColor(context, [UIColor colorWithRed:0.000 green:0.251 blue:0.502 alpha:1.000].CGColor); //气泡填充色
[self getDrawPath:context];
}
//气泡背景绘制
- (void)getDrawPath:(CGContextRef)context
{
CGRect rrect = self.bounds;
CGFloat radius = (kCalloutHeight - kArrorHeight) / 2.0;
CGFloat midx = CGRectGetMidX(rrect);
CGFloat maxy = CGRectGetMaxY(rrect) - kArrorHeight;//调节离底部的位置
CGFloat midy = maxy /2.0;
CGContextSaveGState(context); //保存上下文 1
CGContextBeginPath(context);
//底部三角
CGContextMoveToPoint(context, midx + kArrorHeight, maxy);
CGContextAddLineToPoint(context, midx, maxy + kArrorHeight);
CGContextAddLineToPoint(context, midx - kArrorHeight, maxy);
CGContextFillPath(context); //渲染三角形
CGContextRestoreGState(context); //还原上下文 1
CGContextAddArc(context, midx, midy + 5, radius, 0, M_PI*2, 1);//画圆
CGContextFillPath(context); //渲染圆形
CGContextClosePath(context);
}
@end
3 创建实例
CallOutContentView *callOutView = [[CallOutContentView alloc]initWithFrame:CGRectMake(0, 0, kCalloutWidth, kCalloutHeight)];
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原文地址:http://www.cnblogs.com/bug-sniper/p/5170690.html