我有一个简单的例子,自定义 UIView,它用刻度线(0 - 8000)绘制一条线。单击时我有一个测试按钮,刻度线范围从(0-5000)更改,我强制 setNeedsDisplay 重新绘制刻度线的新标签。我确实在drawrect中输入了新值,但它从不重绘新标签,它只在首次启动时绘制新标签。有什么线索吗?这是代码。
- (void)drawRect:(CGRect)rect //TESTTTTTTTTT
{
CGContextRef context = UIGraphicsGetCurrentContext();
if(test){
// [self setClearsContextBeforeDrawing: YES];
high1=5000;
high2 = 1000;
}
high1 = [[[NSUserDefaults standardUserDefaults] objectForKey:@"MaxScale1"] doubleValue];
high2 = [[[NSUserDefaults standardUserDefaults] objectForKey:@"MaxScale2"] doubleValue];
CGFloat x1,x2,x3;
CGFloat y1top, y2top,y3top;
CGFloat y1bot, y2bot,y3bot;
x1=63;
x2=76;
x3 = x1-5;
float ht = 96;
y1top = y2top = y3top= 114;
y1bot = y2bot= y3bot = y1top+ht;
////Gauge1 /////
float w1 = 308; //gaugeView1.size.width;
float x1Start=5;
float y1 = 90;
float div1= w1/4.0;
CGContextMoveToPoint(context,x1Start, y1);
CGContextAddLineToPoint(context, x1Start, y1+5);
[[UIColor whiteColor] set];
CGRect labrect = CGRectMake(x1Start-2,y1+5, 18, 7);
[[NSString stringWithFormat:@"%d",0] drawInRect:labrect withFont:[UIFont fontWithName:@"Helvetica-Bold" size:7.5]];
CGContextMoveToPoint(context,x1Start+div1, y1);
CGContextAddLineToPoint(context, x1Start+div1, y1+5);
[[UIColor whiteColor] set];
labrect = CGRectMake(x1Start+div1-9,y1+5, 18, 7);
[[NSString stringWithFormat:@"%d",(int)(0.25*high1)] drawInRect:labrect withFont:[UIFont fontWithName:@"Helvetica-Bold" size:7.5]];
CGContextMoveToPoint(context,x1Start+2*div1, y1);
CGContextAddLineToPoint(context, x1Start+2*div1, y1+5);
[[UIColor whiteColor] set];
labrect = CGRectMake(x1Start+2*div1-9,y1+5, 18, 7);
[[NSString stringWithFormat:@"%d",(int)(0.5*high1)] drawInRect:labrect withFont:[UIFont fontWithName:@"Helvetica-Bold" size:7.5]];
CGContextMoveToPoint(context,x1Start+3*div1, y1);
CGContextAddLineToPoint(context, x1Start+3*div1, y1+5);
[[UIColor whiteColor] set];
labrect = CGRectMake(x1Start+3*div1-9,y1+5, 18, 7);
[[NSString stringWithFormat:@"%d",(int)(0.75*high1)] drawInRect:labrect withFont:[UIFont fontWithName:@"Helvetica-Bold" size:7.5]];
CGContextMoveToPoint(context,x1Start+4*div1, y1);
CGContextAddLineToPoint(context, x1Start+4*div1, y1+5);
[[UIColor whiteColor] set];
labrect = CGRectMake(x1Start+4*div1-9,y1+5, 18, 7);
[[NSString stringWithFormat:@"%d",(int)(high1)] drawInRect:labrect withFont:[UIFont fontWithName:@"Helvetica-Bold" size:7.5]];
// CGContextSetStrokeColorWithColor(context, [UIColor blackColor].CGColor);
// CGContextSetLineWidth(context, 2.0);
CGContextStrokePath(context);
}