Get value of hidden for UIImageView??

Toliver182 · 03-12-2010, 04:46 AM

Hi all

Run down:

I have a UIImageView and a button, I have the right outlets and actions set up to interact with them

withing my IBAction method for the button I want an if statement to determine the visablity of the UIImageView then change it to the opposite

something like this

If (myImage.hidden = YES)
{ myImage.hidden = NO;}
else
{ myImage.hidden = YES;}

I think my problem is when gettin the state of myImage as if I simply state

myImage.hidden = YES;

then it hides myImage.

Any suggestions, am I missing something?
To be honest I'm coming from a visual basic background so I could be trying to check the visiblity to completely wrong way!

Thanks for your help!

Sent from my iPhone

chaoz1337 · 03-12-2010, 05:01 AM

Quote:

Originally Posted by Toliver182

Hi all

Run down:

I have a UIImageView and a button, I have the right outlets and actions set up to interact with them

withing my IBAction method for the button I want an if statement to determine the visablity of the UIImageView then change it to the opposite

something like this

If (myImage.hidden = YES)
{ myImage.hidden = NO;}
else
{ myImage.hidden = YES;}

I think my problem is when gettin the state of myImage as if I simply state

myImage.hidden = YES;

then it hides myImage.

Any suggestions, am I missing something?
To be honest I'm coming from a visual basic background so I could be trying to check the visiblity to completely wrong way!

Thanks for your help!

Sent from my iPhone

You are setting the value already inside of your if-clause! You need to use double equal-signs to check if it is hidden or not, otherwise you are setting it!
myImage.hidden==YES is not the same as myImage.hidden=YES.

Change your code to the following and it should work:

Code:

if(myImage.hidden){
myImage.hidden=NO;
}else{
myImage.hidden=YES;
}

firearasi · 03-12-2010, 05:05 AM

You can also use a single line

Code:

 myImage.hidden=!myImage.hidden;

Toliver182 · 03-12-2010, 05:06 AM

Awesome thanks for the quick reply guys!

chaoz1337 · 03-12-2010, 05:11 AM

It's also working with firearasi's solution. I just wrote it out for better understanding. But it does the same.

Duncan C · 03-12-2010, 06:59 AM

Quote:

Originally Posted by chaoz1337

You are setting the value already inside of your if-clause! You need to use double equal-signs to check if it is hidden or not, otherwise you are setting it!
myImage.hidden==YES is not the same as myImage.hidden=YES.

Change your code to the following and it should work:

Code:

if(myImage.hidden){
myImage.hidden=NO;
}else{
myImage.hidden=YES;
}

Personally, I think this is one of the stupidest things about C. Anybody who uses the if (a = b) syntax should be shot for being too cute.

Show me a C programmer who has not wasted many, many hours in his/her career hunting down bugs, only to find that he or she accidentally used an "=" (assignment) instead of an "==" comparison, and I'll show you a programmer who hasn't been programming in C for very long.

This usage should be flagged with a warning by the compiler.

Duncan