利用Bezier可以对一些不规则图形或者不规则的动画都能做到一些很好的处理....
关于Bezier绘制长方形，圆形，弧线，线条简书上都有很多学习资料供大家学习...
感谢简书....
我参考的是：
//www.greatytc.com/p/999ad5ae6edf
//www.greatytc.com/p/281373b6d1a8
UIBazierPath一般和CAShapeLayer配合使用的...
例
UIBezierPath * path1 = [UIBezierPath bezierPath];
path1.lineWidth = 10;
path1.lineCapStyle = kCGLineCapRound;
[path1 moveToPoint:CGPointMake(10, 10)];
[path1 addLineToPoint:CGPointMake(100, 100)];
[[UIColor redColor] setStroke];
[path1 stroke];
但是如果你重写了drawrect之后你是没办法动态改变这个view的背景颜色...
参考：
http://blog.csdn.net/xyzdm123/article/details/46891001
初始设置颜色...
-(void)drawRect:(CGRect)rect
{
[[UIColor lightGrayColor] setFill];
UIRectFill(rect);
}
再说一下UIColor的几个方法...
在设置Bezierpath过程中都可以用到....
边框、线条、字符的颜色...
[[UIColor blackColor] setStroke]; // 设置边框颜色
[[UIColor blueColor] setFill]; // 设置背景填充色
[[UIColor greenColor] set]; // 设置字符颜色
使用...
在设置bezier的路径颜色的时候...
[[UIColor blackColor] setStroke];
// [[UIColor greenColor] set]; 这两个效果是一样的
[path stroke];
在设置bezier的填充颜色的时候....
[[UIColor blackColor] setFill];
// [[UIColor greenColor] set]; 这两个效果是一样的
[path fill];
使用-聊天泡泡...
参考...
//www.greatytc.com/p/c3af3e37c95f
以前聊天泡泡都是让UI切一个图然后自己根据要求拉伸...
如果箭头在左右两边还好如果在中间的话...
拉伸会变形...
之前的做法是切三部分的图.左右拉伸中间不动...
但是这样子很麻烦...
用bezier就可以很好的解决这个问题...
通过线.圆.弧线.可以一点一旦拼接出来一个你想要的图案...
例如...
CGFloat w = CGRectGetWidth(rect) - 10;
CGFloat h = CGRectGetHeight(rect) - 10;
CGFloat radius = 8;
CGFloat angleWidth = 6;
UIBezierPath *bezierPath = [UIBezierPath bezierPath];
bezierPath.lineWidth = 1;
bezierPath.lineCapStyle = kCGLineCapRound;
bezierPath.lineJoinStyle = kCGLineJoinRound;
[bezierPath moveToPoint:CGPointMake(w-angleWidth,h-radius)];
[bezierPath addArcWithCenter:CGPointMake(w-radius-angleWidth, h-radius) radius:radius startAngle:0 endAngle:M_PI/2 clockwise:YES];
[bezierPath addArcWithCenter:CGPointMake(radius, h-radius) radius:radius startAngle:M_PI/2 endAngle:M_PI clockwise:YES];
[bezierPath addArcWithCenter:CGPointMake(radius,radius) radius:radius startAngle:M_PI endAngle:3*M_PI/2 clockwise:YES];
[bezierPath addArcWithCenter:CGPointMake(w-radius-angleWidth, radius) radius:radius startAngle:3*M_PI/2 endAngle:2*M_PI clockwise:YES];
[bezierPath addLineToPoint:CGPointMake(w-angleWidth,40/2-angleWidth)];
[bezierPath addLineToPoint:CGPointMake(w, 40/2)];
[bezierPath addLineToPoint:CGPointMake(w-angleWidth, 40/2+angleWidth)];
[bezierPath closePath];
[[UIColor redColor] set];
[bezierPath stroke];
[[UIColor orangeColor] set];
[bezierPath fill];
听说可以用PaintCode可以自动生成bezier代码...
可以试试...
配合CAKeyframeAnimation制作路劲动画....
参考
//www.greatytc.com/p/4824fc4ce4b0
//www.greatytc.com/p/daa58c99ee1e
大概流程是这样子...
绘制一个你想要他移动动画的bezier路劲...
设置keyframe动画一些基本设置...
设置bezier的path...
CAKeyframeAnimation *anim = [CAKeyframeAnimation animationWithKeyPath:@"position"];
anim.fillMode=kCAFillModeRemoved;
anim.removedOnCompletion = NO;
anim.path = bezierPath.CGPath;
anim.duration = 3;
anim.repeatCount = 20;
anim.autoreverses = YES;
anim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
[shapeLayer addAnimation:anim forKey:nil];
具体效果可去demo中首页的UIBezierPath查看...
配合CAShapeLayer使用...
shapeLayer是一个layer可以直接加到视图的sublayer中去...
设置很方便...
不需要重写drawrect之类...
CAShapeLayer的fillcolor/strokecolor设置描边和填充...
例如：
UIBezierPath * path3 = [UIBezierPath bezierPath];
[path3 moveToPoint:CGPointMake(30, height*0.65)];
[path3 addLineToPoint:CGPointMake(30, height)];
[path3 addLineToPoint:CGPointMake(width, height)];
[path3 addLineToPoint:CGPointMake(width, height*0.65)];
[path3 addQuadCurveToPoint:CGPointMake(30, height*0.65) controlPoint:CGPointMake((width-30)*0.5+30, height*0.65-100)];
[path3 closePath];
CAShapeLayer * layer3 = [[CAShapeLayer alloc] init];
layer3.fillColor = [[UIColor blueColor] colorWithAlphaComponent:0.2].CGColor;
layer3.strokeColor = [UIColor yellowColor].CGColor;
layer3.path = path3.CGPath;
[superV.layer addSublayer:layer3];
效果：
通过bezier设置阴影的路径
如果有很多视图都用设置了阴影...
指定阴影的路径会解决阴影的卡顿问题...
imageV.layer.shadowPath = [UIBezierPath bezierPathWithRect:imageV.bounds].CGPath;
画波浪线...
原理跟绘制聊天泡泡是一个道理...
可以少了很多不必要的切图...
例如
CGFloat offY = 30;
CGFloat offX = 10;
CGFloat waveWidth = 5;
CGFloat waveHeight = 5;
CGFloat width = CGRectGetWidth(self.view.frame)-2*offX;
CAShapeLayer * layer1 = [[CAShapeLayer alloc] init];
layer1.lineWidth = 1;
layer1.fillColor = [UIColor clearColor].CGColor;
layer1.strokeColor = [UIColor blueColor].CGColor;
UIBezierPath * path1 = [UIBezierPath bezierPath];
[path1 moveToPoint:CGPointMake(offX, offY)];
path1.lineJoinStyle = kCGLineJoinRound;
for(int i=0; i < width/waveWidth; i++)
{
[path1 addLineToPoint:CGPointMake(offX+(i+0.5)*waveWidth, offY)];
[path1 addLineToPoint:CGPointMake(offX+(i+1)*waveWidth, offY+waveHeight)];
}
layer1.path = path1.CGPath;
[superV.layer addSublayer:layer1];
效果...
