Inverting a BOOL property without using dot syntax

Question

In this line of code I am reversing a BOOL value:

 someObject.boolValue = ![someObject boolValue];

How can I rewrite this line in "pure" Objective-C syntax, without dot syntax?

There is nothing wrong with dot syntax. Internally that is converted to the below answers only. Dont hesitate to use that. — iDev, Dec 10 '12 at 19:06
just in case (from AppleDoc): "Dot syntax is purely a convenient wrapper around accessor method calls. When you use dot syntax, the property is still accessed or changed using the getter and setter methods." — , Dec 10 '12 at 20:37

score 3 · Answer 1 · answered Dec 10 '12 at 16:58

3

use

[someObject setBoolValue:!([someObject boolValue])];

answered Dec 10 '12 at 16:58

Boris Prohaska

912
6
16

score 2 · Accepted Answer · answered Dec 10 '12 at 16:57

2

[someObject setBoolValue:![someObject boolValue]];

answered Dec 10 '12 at 16:57

Jason Whitehorn

13,585
9
54
68

score 1 · Answer 3 · answered Dec 10 '12 at 19:45

Always use NSNumber to avoid your BOOL getting a non-boolean (greater than one) value set to it.

NSNumber * currValue = [NSNumber numberWithBOOL:[someObject boolValue]];
NSNumber * yesNum = [NSNumber numberWithBOOL:YES];
NSNumber * noNum = [NSNumber numberWithBOOL:NO];

if( NSOrderedSame == [currValue compare:yesNum] ){
    [someObject setBoolValue:[noNum boolValue]];
}
else if( NSOrderedSame == [currValue compare:noNum] ){
    [someObject setBoolValue:[yesNum boolValue]];
}
else {
    // Set default
    [someObject setBoolValue:[yesNum boolValue]];
}

Inverting a BOOL property without using dot syntax

3 Answers3