Question

I have a UISlider which I’d like to allow a selection between 0.5 and 10. When the callback is fired to set the value of a label when the value changes, I get a strange range of values. The code I have is:

-(IBAction)DidChangeSliderValue:(id)sender {
    NSString *distance = [NSString stringWithFormat:@"%i miles", sdrDistance.value];
    lblDistance.text = distance;
    NSLog(distance);

I have the slider set up as follows:

However, dragging from left to right results in this to the log:

1-07-12 16:38:24.354 myapp[2758:207] 1073741824 miles
2011-07-12 16:38:24.355 myapp[2758:207] 0 miles
2011-07-12 16:38:24.356 myapp[2758:207] 0 miles
2011-07-12 16:38:27.873 myapp[2758:207] 0 miles
2011-07-12 16:38:27.890 myapp[2758:207] -1073741824 miles
2011-07-12 16:38:27.924 myapp[2758:207] -2147483648 miles
2011-07-12 16:38:27.941 myapp[2758:207] 536870912 miles
2011-07-12 16:38:27.957 myapp[2758:207] -2147483648 miles
2011-07-12 16:38:27.991 myapp[2758:207] 1073741824 miles
2011-07-12 16:38:28.007 myapp[2758:207] -536870912 miles
2011-07-12 16:38:28.023 myapp[2758:207] 1073741824 miles
2011-07-12 16:38:28.041 myapp[2758:207] 536870912 miles
2011-07-12 16:38:28.058 myapp[2758:207] -536870912 miles
2011-07-12 16:38:28.074 myapp[2758:207] 1073741824 miles
2011-07-12 16:38:28.091 myapp[2758:207] 536870912 miles
2011-07-12 16:38:28.141 myapp[2758:207] 0 miles

Is there any logical reason for this?

Answer 1

[UISlider value] returns a float, not an int, so you have to use %f instead of %i in your NSLog statement.