我的问题:正方形填充的颜色从黑色变为全蓝色(255),没有过渡颜色(最深的蓝色,深蓝色,蓝色......)。似乎 CGContextSetRGBStroke 是相加的 (WTF Oo) 。就像如果蓝色是 14 并且下一次更新我放 140 蓝色将是 154 而不是 140 我设置了。
有人遇到这个问题吗?
在.h
CGFloat angle;
int width;
int height;
NSTimer* timer;
CGPoint touch;
在他们中
- (id)initWithFrame:(CGRect)frame
{
if ((self = [super initWithFrame:frame]))
{
angle=0;
width = frame.size.width;
height= frame.size.height;
//self.backgroundColor=[UIColor colorWithRed:0.1 green:0.1 blue:1 alpha:1];
timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(update:) userInfo:nil repeats:YES];
}
return self;
}
-(void)update:(NSTimer*)theTimer
{
[self setNeedsDisplay];
}
NS_INLINE CGFloat radians(CGFloat ang)
{
return ang*(M_PI/180.0f);
}
- (void)drawRect:(CGRect)rect
{
CGContextRef ctx=UIGraphicsGetCurrentContext();
//CGContextSetRGBFillColor(ctx, -1,-1,-1,-1);
CGContextSaveGState(ctx);
CGRect ourRect = CGRectMake(40+angle, 40+angle, 240, 120);
CGFloat colour=(touch.y/768)*255;
NSQLog(@"draw %f",colour);
CGContextSetRGBFillColor(ctx, 0.0,0.0,colour,1);
CGContextClearRect(ctx, rect);
CGContextFillRect(ctx, ourRect);
CGContextSetRGBStrokeColor(ctx, 0.0, 1.0, 0.0, 1.0);
CGContextStrokeRectWithWidth(ctx, ourRect, 10);
CGContextRestoreGState(ctx);
angle+=1;
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
touch= [[touches anyObject] locationInView:self];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
touch= [[touches anyObject] locationInView:self];
}