如何在iOS中绘制分段圆？

Question

我预计很容易找到这个问题的答案，但不幸的是，我的搜索没有产生任何结果。如何在iOS中绘制这样的圈子？

Answer 1

我结束了使用UIBezierPath。这是我的画给定的循环：

CGFloat DegreesToRadians(CGFloat degrees) 
{ 
    return degrees * M_PI/180; 
}; 

- (void)drawRect:(CGRect)rect 
{ 
CGFloat radius = 70; 
CGPoint center = CGPointMake(90 + radius, 170 + radius); 
CGFloat start = DegreesToRadians(-90), end; 

NSArray *angles = @[@"0", @"60", @"-90"]; 
NSArray *colors = @[[UIColor yellowColor], [UIColor blueColor], [UIColor redColor]]; 

int col_counter = 0; 

for (NSString *angle in angles) 
{ 
    CGFloat value = [angle floatValue]; 
    end = DegreesToRadians(value); 

    CGPoint next; 
    next.x = center.x + radius * cos(start); 
    next.y = center.y + radius * sin(start); 

    UIBezierPath *path = [UIBezierPath bezierPath]; 

    [path moveToPoint:center]; 
    [path addLineToPoint:next]; 
    [path addArcWithCenter:center radius:radius startAngle:start endAngle:end clockwise:YES]; 
    [path addLineToPoint:center]; 

    UIColor *color = colors[col_counter]; 
    [color set]; 
    [path fill]; 

    col_counter++; 

    start = end; 
} 
} 

Answer 2

使用安德烈的回答，我能够在循环后添加一小段代码中添加一个白色的圆圈，中间要创造什么看起来像一个白色圆圈用厚实，多彩的边框。

end = DegreesToRadians(360); 

start = DegreesToRadians(-90); 

int width = 10; // thickness of the circumference 
radius -= width; 

CGPoint next; 
next.x = center.x + radius * cos(start); 
next.y = center.y + radius * sin(start); 

UIBezierPath *path = [UIBezierPath bezierPath]; 

[path moveToPoint:center]; 
[path addLineToPoint:next]; 
[path addArcWithCenter:center radius:radius startAngle:start endAngle:end clockwise:YES]; 
[path addLineToPoint:center]; 

UIColor *color = [UIColor whiteColor]; 
[color set]; 
[path fill];