Iphone 值未进入UISlider的拇指中
这是我用来在拇指图像中显示滑块值的代码。但该值仍显示在滑块下方。请帮帮我Iphone 值未进入UISlider的拇指中,iphone,uislider,Iphone,Uislider,这是我用来在拇指图像中显示滑块值的代码。但该值仍显示在滑块下方。请帮帮我 -(IBAction)sliderValueChanged:(id)sender { UISlider *aSlider = (UISlider *)sender; [aSlider setThumbImage: [self addText:self.thumbImage text:[NSString stringWithFormat:@"%.0f", aSlider.va
-(IBAction)sliderValueChanged:(id)sender
{
UISlider *aSlider = (UISlider *)sender;
[aSlider setThumbImage:
[self addText:self.thumbImage text:[NSString stringWithFormat:@"%.0f",
aSlider.value * 100]] forState:aSlider.state];
}
//Add text to UIImage
-(UIImage *)addText:(UIImage *)img text:(NSString *)text1{
int w = img.size.width;
int h = img.size.height;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w,
colorSpace, kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
char* text= (char *)[text1 cStringUsingEncoding:NSASCIIStringEncoding];
CGContextSelectFont(context, "Arial",12, kCGEncodingMacRoman);
CGContextSetTextDrawingMode(context, kCGTextFill);
CGContextSetRGBFillColor(context, 0, 0, 0, 1);
CGContextShowTextAtPoint(context,3,8,text, strlen(text));
CGImageRef imgCombined = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
UIImage *retImage = [UIImage imageWithCGImage:imgCombined];
CGImageRelease(imgCombined);
return retImage;
实际上,您只需要更改CGCOntextShowTextAtPoint中的值就可以在您的拇指中看到它。我刚刚完成这项工作,这项工作非常好。我只想知道是否有办法改变字体的颜色,而要改变文本的颜色,可以改变方法CGContextSetRGBFillColor(context,255255255,1);根据你的需要。