iOS 绘制气泡图案

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通过重写UIView的DrawRect方法绘制气泡

-(void)drawRect:(CGRect)rect{

[self drawInContext:UIGraphicsGetCurrentContext()];

self.layer.shadowColor = [[UIColor blackColor] 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:255.0/255.0 green:255.0/255.0 blue:255.0/255.0 alpha:1.0].CGColor);
[self getDrawPath:context];
CGContextFillPath(context);
}
- (void)getDrawPath:(CGContextRef)context
{
CGRect rrect = self.bounds;
CGFloat radius = 6.0;
CGFloat minx = CGRectGetMinX(rrect),
midx = CGRectGetMidX(rrect),
maxx = CGRectGetMaxX(rrect);
CGFloat miny = CGRectGetMinY(rrect),
// midy = CGRectGetMidY(rrect),
maxy = CGRectGetMaxY(rrect)-Arror_height;
CGContextMoveToPoint(context, midx+Arror_height, maxy);
CGContextAddLineToPoint(context,midx, maxy+Arror_height);
CGContextAddLineToPoint(context,midx-Arror_height, maxy);
CGContextAddArcToPoint(context, minx, maxy, minx, miny, radius);
CGContextAddArcToPoint(context, minx, minx, maxx, miny, radius);
CGContextAddArcToPoint(context, maxx, miny, maxx, maxx, radius);
CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius);
CGContextClosePath(context);
}

原文链接：http://www.jianshu.com/p/7cf2748df65c

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