Some notes about performSelector method

 

SEL theSelector = NSSelectorFromString(@"setOrientation:animated:");
NSInvocation *anInvocation = [NSInvocation
                                                          invocationWithMethodSignature:
                                                          [MPMoviePlayerController instanceMethodSignatureForSelector:theSelector]];

[anInvocation setSelector:theSelector];
[anInvocation setTarget:theMovie];
UIInterfaceOrientation val = UIInterfaceOrientationPortrait;
BOOL anim = NO;
[anInvocation setArgument:&val atIndex:2];
[anInvocation setArgument:&anim atIndex:3];

[anInvocation invoke];

 
    
 
     
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- (BOOL)performBoolSelectorFromString:(NSString *)selStr

{

BOOL result;

SEL theSelector = NSSelectorFromString(selStr);

NSInvocation *anInvocation = [NSInvocation

invocationWithMethodSignature:

[[self class]

instanceMethodSignatureForSelector:theSelector]];



[anInvocation setSelector:theSelector];

[anInvocation setTarget:self];



[anInvocation invoke];

[anInvocation getReturnValue:&result];

return result;

}

 
       
 
        
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- (NSInteger)testSelectorString:(NSString *)string integer:(NSInteger)integer { return [string intValue] + integer + 1; } - (void)test { SEL theSelector = @selector(testSelectorString:integer:); NSInvocation *anInvocation = [NSInvocation invocationWithMethodSignature:[ClassName instanceMethodSignatureForSelector:theSelector]]; [anInvocation setSelector:theSelector]; [anInvocation setTarget:self]; NSInteger integer = 4; NSString *string = @"3"; [anInvocation setArgument:&string atIndex:2]; [anInvocation setArgument:&integer atIndex:3]; [anInvocation invoke]; NSInteger result; [anInvocation getReturnValue:&result]; NSLog(@"%d", result); }