IOS第16天(3,Quartz2D饼图)
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#import "HMPieView.h" #import "UIColor+Random.h" @implementation HMPieView - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { // Initialization code } return self; } // Only override drawRect: if you perform custom drawing. // An empty implementation adversely affects performance during animation. - (void)drawRect:(CGRect)rect { // Drawing code NSArray *data = @[@25,@25,@50]; // 1.获取上下文 CGContextRef ctx = UIGraphicsGetCurrentContext(); // 2.拼接路径 CGPoint center = CGPointMake(125, 125); CGFloat radius = 120; CGFloat startA = 0; CGFloat angle = 0; CGFloat endA = 0; for (NSNumber *number in data) { // 2.拼接路径 startA = endA; angle = number.intValue / 100.0 * M_PI * 2; endA = startA + angle; UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startA endAngle:endA clockwise:YES]; [path addLineToPoint:center]; [[UIColor randomColor] set]; // 把路径添加上下文 CGContextAddPath(ctx, path.CGPath); // 渲染 CGContextFillPath(ctx); } } - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { CGFloat a = arc4random_uniform(6); //CGFloat a = arc4random()%6; NSLog(@"随机数--%f",a); [self setNeedsDisplay]; } - (void)drawPie { // 1.获取上下文 CGContextRef ctx = UIGraphicsGetCurrentContext(); // 2.拼接路径 CGPoint center = CGPointMake(125, 125); CGFloat radius = 120; CGFloat startA = 0; CGFloat angle = 0; CGFloat endA = 0; // 第一个扇形 angle = 25 / 100.0 * M_PI * 2; endA = startA + angle; UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startA endAngle:endA clockwise:YES]; [path addLineToPoint:center]; // 添加到上下文 CGContextAddPath(ctx, path.CGPath); [[UIColor redColor] set]; // 渲染 CGContextFillPath(ctx); // 第二个扇形 startA = endA; angle = 25 / 100.0 * M_PI * 2; endA = startA + angle; UIBezierPath *path1 = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startA endAngle:endA clockwise:YES]; [path1 addLineToPoint:center]; // 添加到上下文 CGContextAddPath(ctx, path1.CGPath); [[UIColor greenColor] set]; // 渲染 CGContextFillPath(ctx); // 第三个扇形 startA = endA; angle = 50 / 100.0 * M_PI * 2; endA = startA + angle; UIBezierPath *path2 = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startA endAngle:endA clockwise:YES]; [path2 addLineToPoint:center]; // 添加到上下文 CGContextAddPath(ctx, path2.CGPath); [[UIColor blueColor] set]; // 渲染 CGContextFillPath(ctx); } @end
没有失败, 只有放弃...