iPhone – iOS RGB颜色不正确？

概述UIGraphicsBeginImageContext(self.view.frame.size); [drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)]; CGContextSetLineCap(UIGraphicsGetCurr

UIGraphicsBeginImageContext(self.vIEw.frame.size);    [drawImage.image drawInRect:CGRectMake(0,self.vIEw.frame.size.wIDth,self.vIEw.frame.size.height)];    CGContextSetlineCap(UIGraphicsGetCurrentContext(),kCGlineCapRound);    CGContextSetlinewidth(UIGraphicsGetCurrentContext(),8.0);    CGContextSetRGBstrokecolor(UIGraphicsGetCurrentContext(),135.0,213.0,0.0,1.0);    CGContextBeginPath(UIGraphicsGetCurrentContext());    CGContextMovetoPoint(UIGraphicsGetCurrentContext(),currentPoint.x,currentPoint.y);    CGContextAddlinetoPoint(UIGraphicsGetCurrentContext(),currentPoint.y);    CGContextstrokePath(UIGraphicsGetCurrentContext());    drawImage.image = UIGraphicsGetimageFromCurrentimageContext();    UIGraphicsEndImageContext();

我画线使用RGB(135,213,0),RGB(135,0)应该是green.但iOS显示黄线!!为什么？

解决方法 您需要具有[0,1]范围内的值.因此,您需要将每个值除以255.

CGContextSetRGBstrokecolor(UIGraphicsGetCurrentContext(),135.0/255.0,213.0/255.0,1.0);

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