NSUserDefaults and boolean - what is going on ? Objective C

Question

I have this simple code to save and restore boolean from NSUserDefaults. At the end when I do

po [defaults boolForKey:@"dummy"]

in the debugger I see nil.

What is going on here ?

// Store the data
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

[defaults setBool:(BOOL)boolValue forKey:@"dummy"];

[defaults synchronize];

BOOL ans = [defaults boolForKey:@"dummy"];

Where am I wrong ?

Thanks!

UPDATED: Thanks! Now clear

It can be many issues. One of them can be due to the actual value of boolValue. What is the value of it? Is it NO or YES? Second, -synchronize might not work immediately, because that can take a while to happen. What does happen if you delay the rereading of the default? — jvarela, May 31 '18 at 16:06
What's the actual question/issue here? You make no attempt to explain what is wrong with the code you posted. — rmaddy, May 31 '18 at 19:25
Closed on the assumption that the issue is why a `BOOL` appears as `nil` using `po` in the debugger. If that's not the question then I will reopen. — rmaddy, May 31 '18 at 19:27

Andrey Chernukha · Answer 1 · 2018-05-31T16:00:48.490

4

If you do

p [defaults boolForKey:@"dummy"]

(which is a proper debugging command for printing primitive types) instead of

po [defaults boolForKey:@"dummy"]

you will see NO

po means print object and is suitable for descendants of NSObject

p is just print and is suitable for primitives like BOOL or int

edited May 31 '18 at 16:00

answered May 31 '18 at 15:55

Andrey Chernukha

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NSUserDefaults and boolean - what is going on ? Objective C

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