在家閑來無事，于是就看起來ios繪圖的那塊，寫點什么好呢？

鼓搗了一會，總算寫出了一個小東西

這個是寫完以后的效果

這里我實現了三種款式的alertview
分別是成功，錯誤和警告，剩下的呢有空繼續添加吧。

廢話不說了，講一下代碼的思路

我用的是UIBezierPath進行繪圖

ios有很多種繪圖的方式，要講的話在寫幾篇都寫不完，這里就不詳細介紹了。

UIBezierPath繪圖分三個步驟

1.創建UIBezierPath路徑
2.創建CAShapeLayer
3.將layer附加到圖層

2和3之間還可以添加動畫

[_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];

這個代碼段是用來繪制一個嘆號

GitHub代碼在這