KVO test

gistfile1.m

/*

2013-10-28 11:05:58.558 ivar_kvo_test[17451:303] ivar = 
2013-10-28 11:05:58.559 ivar_kvo_test[17451:303] _ivarWithManualSetter = 
2013-10-28 11:05:58.559 ivar_kvo_test[17451:303] _prop = 
2013-10-28 11:05:58.560 ivar_kvo_test[17451:303] _propWithSetter = 
2013-10-28 11:05:58.560 ivar_kvo_test[17451:303] setValue:forKey:ivar
2013-10-28 11:05:58.561 ivar_kvo_test[17451:303]   observeValueForKeyPath: ivar
2013-10-28 11:05:58.561 ivar_kvo_test[17451:303] setValue:forKey:ivarWithManualSetter
2013-10-28 11:05:58.561 ivar_kvo_test[17451:303]   observeValueForKeyPath: ivarWithManualSetter
2013-10-28 11:05:58.561 ivar_kvo_test[17451:303] setValue:forKey:prop
2013-10-28 11:05:58.562 ivar_kvo_test[17451:303]   observeValueForKeyPath: prop
2013-10-28 11:05:58.562 ivar_kvo_test[17451:303] setValue:forKey:propWithSetter
2013-10-28 11:05:58.562 ivar_kvo_test[17451:303]   observeValueForKeyPath: propWithSetter
2013-10-28 11:05:58.563 ivar_kvo_test[17451:303] ivar has no setter
2013-10-28 11:05:58.563 ivar_kvo_test[17451:303] setIvarWithManualSetter:
2013-10-28 11:05:58.563 ivar_kvo_test[17451:303]   observeValueForKeyPath: ivarWithManualSetter
2013-10-28 11:05:58.564 ivar_kvo_test[17451:303] setProp:
2013-10-28 11:05:58.564 ivar_kvo_test[17451:303]   observeValueForKeyPath: prop
2013-10-28 11:05:58.564 ivar_kvo_test[17451:303] setterForPropWithSetter:

*/

#import <Foundation/Foundation.h>

@interface Test : NSObject {
    NSString *_ivar;
    NSString *_ivarWithManualSetter;
}

@property(nonatomic, retain) NSString *prop;
@property(nonatomic, retain, setter = setterForPropWithSetter:) NSString *propWithSetter;
@end

@implementation Test

- (id)init {
    self = [super init];
    if (self == nil) {
        return nil;
    }
    
    [self addObserver:self forKeyPath:@"ivar" options:0 context:NULL];
    [self addObserver:self forKeyPath:@"ivarWithManualSetter" options:0 context:NULL];
    [self addObserver:self forKeyPath:@"prop" options:0 context:NULL];
    [self addObserver:self forKeyPath:@"propWithSetter" options:0 context:NULL];

    NSLog(@"ivar = ");
    _ivar = @"a";
    NSLog(@"_ivarWithManualSetter = ");
    _ivarWithManualSetter = @"a";
    NSLog(@"_prop = ");
    _prop = @"a";
    NSLog(@"_propWithSetter = ");
    _propWithSetter = @"a";
    
    NSLog(@"setValue:forKey:ivar");
    [self setValue:@"b" forKey:@"ivar"];
    NSLog(@"setValue:forKey:ivarWithManualSetter");
    [self setValue:@"b" forKey:@"ivarWithManualSetter"];
    NSLog(@"setValue:forKey:prop");
    [self setValue:@"b" forKey:@"prop"];
    NSLog(@"setValue:forKey:propWithSetter");
    [self setValue:@"b" forKey:@"propWithSetter"];
    
    NSLog(@"ivar has no setter");
    NSLog(@"setIvarWithManualSetter:");
    [self setIvarWithManualSetter:@"c"];
    NSLog(@"setProp:");
    [self setProp:@"c"];
    NSLog(@"setterForPropWithSetter:");
    [self setterForPropWithSetter:@"c"];
    
    return self;
}

- (void)setIvarWithManualSetter:(NSString *)ivarWithManualSetter {
    _ivarWithManualSetter = ivarWithManualSetter;
}

- (void)dealloc {
    [self removeObserver:self forKeyPath:@"ivar"];
    [self removeObserver:self forKeyPath:@"ivarWithManualSetter"];
    [self removeObserver:self forKeyPath:@"prop"];
    [self removeObserver:self forKeyPath:@"propWithSetter"];
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    NSLog(@"  observeValueForKeyPath: %@", keyPath);
}

@end

int main(int argc, const char * argv[])
{
    (void)[[Test alloc] init];

    return 0;
}