iOS：繪圖

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1、UIBezierPath（貝茲路徑）

　　1-1）、在重寫 drawRect: 方法裡使用

　　　　使用不難，看 UIBezierPath.h 基本都會用，值得注意的是，顏色設定如下：

[[UIColor redColor]set];

　　　　下面是學習過程中的代碼

- (void)drawRect:(CGRect)rect{    //矩形    UIBezierPath *path1 = [UIBezierPath bezierPathWithRect:CGRectMake(20, 20, 50, 50)];    [[UIColor grayColor]set];    [path1 stroke];    //內切圓    UIBezierPath *path2 = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(100, 20, 50, 50)];    [[UIColor blueColor]set];    [path2 fill];    [path2 stroke];    //切4個圓角    UIBezierPath *path3 = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(200, 20, 50, 50) cornerRadius:15.0];    [[UIColor greenColor]set];    [path3 stroke];    //切1-4個圓角(最後一個參數cornerRadii，好像就size.width有效果？)    UIBezierPath *path4 = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(300, 20, 50, 50) byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight  cornerRadii:CGSizeMake(15.0, 35.0)];    [[UIColor whiteColor]set];    [path4 stroke];    //弧形    UIBezierPath *path5 = [UIBezierPath bezierPathWithArcCenter:CGPointMake(50, 120) radius:25.0 startAngle:M_PI endAngle:M_PI/4 clockwise:YES];    [[UIColor yellowColor]set];    [path5 stroke];    //畫直線    UIBezierPath *path6 = [UIBezierPath bezierPath];    [path6 setLineWidth:3.0];    [[UIColor redColor]set];    [path6 moveToPoint:CGPointMake(100, 100)];    [path6 addLineToPoint:CGPointMake(150, 100)];    [path6 addLineToPoint:CGPointMake(150, 150)];    [path6 addLineToPoint:CGPointMake(100, 150)];    [path6 addLineToPoint:CGPointMake(100, 100)];    [path6 addLineToPoint:CGPointMake(200, 125)];    [path6 addLineToPoint:CGPointMake(150, 150)];    [path6 closePath];    path6.usesEvenOddFillRule = YES;    [path6 fill];    [path6 stroke];        //貝茲路徑    UIBezierPath *path7 = [UIBezierPath bezierPath];    [path7 setLineWidth:5.0];    [[UIColor orangeColor]set];    [path7 moveToPoint:CGPointMake(200, 100)];    [path7 addCurveToPoint:CGPointMake(300, 100) controlPoint1:CGPointMake(250, 150) controlPoint2:CGPointMake(275, 50)];    [path7 stroke];        //貝茲路徑    UIBezierPath *path8 = [UIBezierPath bezierPath];    [path8 setLineWidth:5.0];    [[UIColor purpleColor]set];    [path8 moveToPoint:CGPointMake(200, 150)];    [path8 addQuadCurveToPoint:CGPointMake(300, 150) controlPoint:CGPointMake(250, 200)];    [path8 stroke];        //帶圓心到起始角度線段的弧形    UIBezierPath *path9 = [UIBezierPath bezierPath];    [path9 setLineWidth:5.0];    [[UIColor brownColor]set];    [path9 moveToPoint:CGPointMake(50, 200)];    [path9 addArcWithCenter:CGPointMake(50, 200) radius:25.0 startAngle:0.0 endAngle:M_PI clockwise:YES];    [path9 stroke];        //虛線    UIBezierPath *path10 = [UIBezierPath bezierPath];    [path10 setLineWidth:5.0];    [[UIColor whiteColor]set];    [path10 moveToPoint:CGPointMake(10, 300)];    [path10 addLineToPoint:CGPointMake(SCREEN_WIDTH - 10, 300)];    CGFloat lineDash[] = {10.0,2.0,5.0,5.0};    //奇數實線，偶數虛線，phase起始位移    [path10 setLineDash:lineDash count:4 phase:0];    [path10 stroke];}

 

 

　　1-2）、在普通方法裡使用，需要畫布。配合 CAShapeLayer 。

　　　　注意：1、設定線寬、顏色、填充等，都由 CAShapeLayer 完成，UIBezierPath 只完成路徑的繪畫。

　　　　　　　2、CAShapeLayer的大小，可以設成螢幕的大小 SCREEN.BOUNDS。UIBezierPath畫完線條後，自動剪裁，如果沒閉合，會自動連接起點、終點剪裁。

　　　　

　　　　下面是學習過程中的代碼

- (void)drawTest{    //矩形    CGRect rect1 = {20, 20, 50, 50};    UIBezierPath *path1 = [UIBezierPath bezierPathWithRect:rect1];        CAShapeLayer *shapeLayer1 = [[CAShapeLayer alloc]init];    shapeLayer1.position = self.layer.position;    shapeLayer1.bounds = self.layer.bounds;    shapeLayer1.path = path1.CGPath;    shapeLayer1.fillColor = [UIColor grayColor].CGColor;    [self.layer addSublayer:shapeLayer1];    //內切圓    CGRect rect2 = {100, 20, 50, 50};    UIBezierPath *path2 = [UIBezierPath bezierPathWithOvalInRect:rect2];        CAShapeLayer *shapeLayer2 = [[CAShapeLayer alloc]init];    shapeLayer2.position = self.layer.position;    shapeLayer2.bounds = self.layer.bounds;    shapeLayer2.path = path2.CGPath;    shapeLayer2.fillColor = [UIColor blueColor].CGColor;    shapeLayer2.strokeColor = [UIColor orangeColor].CGColor;    shapeLayer2.strokeStart = 0.0;    shapeLayer2.strokeEnd = 0.7;    shapeLayer2.lineWidth = 3.0;    [self.layer addSublayer:shapeLayer2];        //畫線    UIBezierPath *path3 = [UIBezierPath bezierPath];    [path3 moveToPoint:CGPointMake(100, 100)];    [path3 addLineToPoint:CGPointMake(150, 100)];    [path3 addLineToPoint:CGPointMake(150, 150)];    [path3 addLineToPoint:CGPointMake(100, 150)];    [path3 addLineToPoint:CGPointMake(100, 100)];    [path3 addLineToPoint:CGPointMake(200, 125)];    [path3 addLineToPoint:CGPointMake(150, 150)];        CAShapeLayer *shapeLayer3 = [[CAShapeLayer alloc]init];    shapeLayer3.position = self.layer.position;    shapeLayer3.bounds = self.layer.bounds;    shapeLayer3.path = path3.CGPath;    shapeLayer3.fillColor = [UIColor redColor].CGColor;    shapeLayer3.strokeColor = [UIColor orangeColor].CGColor;    shapeLayer3.lineWidth = 3.0;    shapeLayer3.fillRule = kCAFillRuleEvenOdd;    [self.layer addSublayer:shapeLayer3];}

 

 

iOS：繪圖