iOS Need default value to appear when using a switch statement

[StevenHu]

I am using segmented controls and a slider on a view. In most cases, a default value of the control is appearing in a text box when the view controller is first accessed. (These are all created by code, not IB (based on Apple's UICatalog code). But in two cases they are left blank.

In the ViewDidLoad section, I have the following methods that work well except the default value does not appear. I don't know what syntax to use. Can you help?

Thanks,
Steve

For the slider:

- (void)sliderActionRideHeight:(id)sender{
if (labelRideHeight.text) // Don't know how to word this line correctly
	{
	 NSArray *arrayRideHeight = [NSArray arrayWithObjects: @"15.0", @"15.5", @"16.0", @"16.5", @"17.0", @"17.5", nil];
	 
	NSString *labelValueRideHeight;
	labelValueRideHeight = [arrayRideHeight objectAtIndex:(int)sliderRideHeight.value]; // To link slider value to object in array and echo to label.
	labelRideHeight.text = [NSString stringWithFormat:@"%@mm", labelValueRideHeight]; // from a forum post reply
	}

else { labelRideHeight.text = [NSString stringWithFormat:@"%@mm", 25.0]; }  // Default value. Does not work

}

For the segmented control with three buttons (buttons contain images):

- (void)segmentAction:(id)sender
{

	switch ([((UISegmentedControl *)sender) selectedSegmentIndex]) 
	{
		case 0:
			labelBumpSteer.text = @"0 washers"; 
			break;
		case 1:
			labelBumpSteer.text = @"1 washer";
			break;
		case 2:
			labelBumpSteer.text = @"2 washers";
			break;
		default:
			labelBumpSteer.text = @"0 washers"; // Default value. Does not work.
			break;
	}
	return;
}

 

[chown33]

else { labelRideHeight.text = [NSString stringWithFormat:@"%@mm", 25.0]; }  // Default value. Does not work

It doesn't work because 25.0 is a floating-point number, not an object. Don't use a format. Or use @"25.0" instead of 25.0.

 

[StevenHu]

You mean

[NSString:@"25.0mm"];

That doesn't work either, sorry.

 

[chown33]

You mean

[NSString:@"25.0mm"];

That doesn't work either, sorry.

Don't panic. Think it through.

You have this:

labelRideHeight.text = [NSString stringWithFormat:@"%@mm", 25.0];

You should be assigning a constant string object. So something like:

labelRideHeight.text = somethingThat'sAConstantStringObject;

What part of the code you posted is a constant string object?

 

[StevenHu]

That would be 25.0mm.

So this runs without errors:

{ labelRideHeight.text = @"45.0"; }

Hmmm ... still not showing up in the label. Here's the coding for the label:

	yPlacement += kTweenMargin + kLabelHeight;
	rect = CGRectMake(kResultsLeftMargin, // lower number moves left margin to right.
					  yPlacement-35, // higher neg. number raises it.
					  kImageWidth+40,
					  kLabelHeight+5);
	labelRideHeight = [[UILabel alloc] initWithFrame:rect];
	labelRideHeight.backgroundColor = [UIColor whiteColor];
	labelRideHeight.font = [UIFont systemFontOfSize:14];
	labelRideHeight.textAlignment = UITextAlignmentLeft;
	labelRideHeight.textColor = [UIColor blueColor];
	[self.view addSubview:labelRideHeight];