Some notes about performSelector method

最新推荐文章于 2020-04-16 13:09:40 发布

原创最新推荐文章于 2020-04-16 13:09:40 发布 · 730 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#integer #string #class

iOS 专栏收录该内容

34 篇文章

订阅专栏

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];

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

- (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;

}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

- (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);
}