iphone 无法画线

发布于 2024-12-15 12:56:46 字数 606 浏览 0 评论 0原文

我想画一条 2 像素的线..我编写了以下代码，但它没有在视图上绘制任何线或任何内容..请帮助我解决此问题或告诉我此代码中的错误...在代码 < em>pointToBeShown是CGPoint......

- (void)drawRect:(CGRect)rect {
    // Drawing code.    
CGContextRef context =  UIGraphicsGetCurrentContext();      
CGContextSetLineWidth(context, 2.0);    
CGContextSetStrokeColor(context, currentColor.CGColor);         
pointToBeShown.x = 30;  
pointToBeShown.y = 449;
CGContextMoveToPoint(context, pointToBeShown.x, pointToBeShown.y);
CGContextAddLineToPoint(context, (pointToBeShown.x + 1),( pointToBeShown.y + 1));
CGContextStrokePath(context); 
}

原文

I want to draw a line of 2 pixels..I have written the following code but it does not draw any line or anything on the view..Plzz help me regarding this or tell me the error in this code...In code pointToBeShown is CGPoint.....

- (void)drawRect:(CGRect)rect {
    // Drawing code.    
CGContextRef context =  UIGraphicsGetCurrentContext();      
CGContextSetLineWidth(context, 2.0);    
CGContextSetStrokeColor(context, currentColor.CGColor);         
pointToBeShown.x = 30;  
pointToBeShown.y = 449;
CGContextMoveToPoint(context, pointToBeShown.x, pointToBeShown.y);
CGContextAddLineToPoint(context, (pointToBeShown.x + 1),( pointToBeShown.y + 1));
CGContextStrokePath(context); 
}

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故人如初 2024-12-22 12:56:46

你没有收到任何警告吗？

将该行替换

CGContextSetStrokeColor(context, currentColor.CGColor);

为

CGContextSetStrokeColorWithColor(context, currentColor.CGColor);

更新：
正如您在评论中提到的那样更新

CGContextRef context = UIGraphicsGetCurrentContext();
[currentColor set];
CGContextSetLineWidth(context, 2.0);
CGContextFillEllipseInRect(context, CGRectMake(pointToBeShown.x, pointToBeShown.y, 10, 10));

Are you not getting any warning?

Replace the line

CGContextSetStrokeColor(context, currentColor.CGColor);

with

CGContextSetStrokeColorWithColor(context, currentColor.CGColor);

Update:
Update as you mentioned in the comments

CGContextRef context = UIGraphicsGetCurrentContext();
[currentColor set];
CGContextSetLineWidth(context, 2.0);
CGContextFillEllipseInRect(context, CGRectMake(pointToBeShown.x, pointToBeShown.y, 10, 10));

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