iOS float to xx.x to UILabel.text

just66horns · Feb 5, 2010

Hi.

I want to display in my apps view the results of a calculation, in a UILabel.

The calculations are being handled as floats. The error I am getting is
"Incompatible type for argument 1 of setText:"

What am I doing wrong... I know it is related to mishandling of the variable type. How do I get the float to display in the UILabel as xx.x (one digit after the decimal?).

Code:

-(BOOL) textFieldShouldReturn: (UITextField *) textFeildA{
	[textFeildA resignFirstResponder];
	if (moveViewUp) [self scrollTheView:NO];
	float a = [textFieldA.text floatValue];
	float b = [textFieldB.text floatValue];
	float fy = a / b;  
	[self updateDisplay:fy];
	return YES;
}
- (IBAction) updateDisplay: (float) e
{
	[labelAoverB setText: e];
}

Thanks!

dejo · Feb 5, 2010

setText: takes an NSString. What you'll want to look into is the formatting of string objects. The String Programming Guide for Cocoa has a whole chapter on this.

just66horns · Feb 8, 2010

hmmm

OK, I don't get it.
How can I take a float, and convert it to use for the string required for the setText of a UILabel?
Please, more help required.

ChOas · Feb 8, 2010

just66horns said:
OK, I don't get it.
How can I take a float, and convert it to use for the string required for the setText of a UILabel?
Please, more help required.

[NSString stringWithFormat

"%.01f",lazy]

dejo · Feb 8, 2010

just66horns said:
OK, I don't get it.

What, specifically, is it that you don't get?

just66horns said:
How can I take a float, and convert it to use for the string required for the setText of a UILabel?

The very first example in the section of the document I linked you to shows you how to do just that. Please read it.

just66horns said:
Please, more help required.

Please see above.

just66horns · Feb 8, 2010

OK, I get it... Thanks

this worked... My syntax is still poor...

Code:

-(BOOL) textFieldShouldReturn: (UITextField *) textFeildA{
	[textFeildA resignFirstResponder];
	if (moveViewUp) [self scrollTheView:NO];
	float a = [textFieldA.text floatValue];
	float b = [textFieldB.text floatValue];
	float fy = a / b;  
	[self updateDisplay:fy];
	return YES;
}
- (IBAction) updateDisplay: (float) e
{
	[labelAoverB setText:[NSString stringWithFormat:@"%.01f",e]];
}

dejo · Feb 8, 2010

ChOas said:
[NSString stringWithFormat"%.01f",lazy]

.01? How many digits after the radix character are you trying to display with that? If you want 2, then you can just use 2, as in "%.2f".

ChOas · Feb 8, 2010

dejo said:
.01? How many digits after the radix character are you trying to display with that? If you want 2, then you can just use 2, as in "%.2f".

I know, but the guy wanted 1: float to xx.x to UILabel.text

dejo · Feb 9, 2010

ChOas said:
I know, but the guy wanted 1: float to xx.x to UILabel.text

Ah, then they probably would want to use something like @"%0.1f". (Maybe that's what you meant?)

ChOas · Feb 9, 2010

dejo said:
Ah, then they probably would want to use something like @"%0.1f". (Maybe that's what you meant?)

Actually I meant %.1f, somehow I was thinking of 0-leading ints.

(probably from the xx part (good band, btw))

Anyways, for precision 01 an 1 are the same, so no harm done.

dejo · Feb 9, 2010

ChOas said:
Anyways, for precision 01 an 1 are the same, so no harm done.

True dat.

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iOS float to xx.x to UILabel.text

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