Objective-c – Hide UISlider thumb image

iphoneobjective cuislider

I am trying to create a UISlider without the thumb image.

How can I do this, this is my code so far:

UISlider *sli = [[UISlider alloc] initWithFrame:progressView.frame];
    [sli setThumbImage:nil forState:UIControlStateNormal];
    [sli setBackgroundColor:[UIColor clearColor]];

    [sli setMinimumTrackImage:[[UIImage imageNamed:@"ProgressBlueCap.png"] stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0] forState:UIControlStateNormal];
    [sli setMaximumTrackImage:[[UIImage imageNamed:@"ProgressBlueCapRight.png"] stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0] forState:UIControlStateNormal];

Best Answer

Much simpler:

Objc

[sli setThumbImage:[[[UIImage alloc] init] autorelease] forState:UIControlStateNormal];

Swift version

sli.setThumbImage(UIImage(), for: .normal)

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Iphone – How to get the center of the thumb image of UISlider

This will return the correct X position of center of thumb image of UISlider in view coordinates:

- (float)xPositionFromSliderValue:(UISlider *)aSlider {
     float sliderRange = aSlider.frame.size.width - aSlider.currentThumbImage.size.width;
     float sliderOrigin = aSlider.frame.origin.x + (aSlider.currentThumbImage.size.width / 2.0);

     float sliderValueToPixels = (((aSlider.value - aSlider.minimumValue)/(aSlider.maximumValue - aSlider.minimumValue)) * sliderRange) + sliderOrigin;

     return sliderValueToPixels;
}

Put it in your view controller and use it like this: (assumes property named slider)

float x = [self xPositionFromSliderValue:self.slider];

C++ IntelliSense ‘auto’ feature? Where is it? How to get it ‘on’

In C++, IntelliSense is turned on by default (and AFAIK there isn't even an official way to turn it off). However, when you're coming from C#, you might think it's turned off, because it's so much less powerful in C++. (The reason for this is that C++ is much, much harder to parse. You can find more information on the subject here and here.)

Visual Assist improves C++ considerably (although it might not be all that considerably when you're used to C#), but I don't think you can install plugins in the express edition.

Best Answer

Much simpler:

Related Solutions

Iphone – How to get the center of the thumb image of UISlider

C++ IntelliSense ‘auto’ feature? Where is it? How to get it ‘on’

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