在家闲来无事，于是就看起来ios绘图的那块，写点什么好呢？
鼓捣了一会，总算写出了一个小东西
这个是写完以后的效果
image
image
image
这里我实现了三种款式的alertview
分别是成功，错误和警告，剩下的呢有空继续添加吧。
废话不说了，讲一下代码的思路
我用的是UIBezierPath进行绘图
ios有很多种绘图的方式，要讲的话在写几篇都写不完，这里就不详细介绍了。
UIBezierPath绘图分三个步骤
1.创建UIBezierPath路径
2.创建CAShapeLayer
3.将layer附加到图层
2和3之间还可以添加动画
[_logoView removeFromSuperview];
_logoView = [[UIView alloc] initWithFrame:CGRectMake(([self getSelfSize].width-Simble_SIZE)/2, Simble_TOP, Simble_SIZE, Simble_SIZE)];
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(Simble_SIZE/2, Simble_SIZE/2) radius:Simble_SIZE/2 startAngle:0 endAngle:M_PI*2 clockwise:YES];
path.lineCapStyle = kCGLineCapRound;
path.lineJoinStyle = kCGLineCapRound;
[path moveToPoint:CGPointMake(Simble_SIZE/2, Simble_SIZE/6)];
CGPoint p1 = CGPointMake(Simble_SIZE/2, Simble_SIZE/6*3.8);
[path addLineToPoint:p1];
[path moveToPoint:CGPointMake(Simble_SIZE/2, Simble_SIZE/6*4.5)];
[path addArcWithCenter:CGPointMake(Simble_SIZE/2, Simble_SIZE/6*4.5) radius:2 startAngle:0 endAngle:M_PI*2 clockwise:YES];
CAShapeLayer *layer = [[CAShapeLayer alloc] init];
layer.fillColor = [UIColor clearColor].CGColor;
layer.strokeColor = [UIColor orangeColor].CGColor;
layer.lineWidth = 5;
layer.path = path.CGPath;
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:NSStringFromSelector(@selector(strokeEnd))];
animation.fromValue = @0;
animation.toValue = @1;
animation.duration = 0.5;
[layer addAnimation:animation forKey:NSStringFromSelector(@selector(strokeEnd))];
[_logoView.layer addSublayer:layer];
[self addSubview:_logoView];
这个代码段是用来绘制一个叹号
