在Objective-C中将BOOL转换为id

Question

这是我的代码：

[delegate performSelectorOnMainThread:@selector(setVariablePremierAffichage:) withObject:TRUE waitUntilDone:NO];

问题是参数“withObject”只采用“id”类型，那么，如何将我的值“TRUE”转换为id类型？我还在Xcode for iOS 5中使用ARC内存管理。

Answer 1

传递NSNumber。使用boolNumber = [NSNumber numberWithBool:TRUE]。您的方法应定义为：

-(void)setVariablePremierAffichage:(NSNumber *)boolNumber
{
    BOOL value = [boolNumber boolValue];
    // do something
}

Answer 2

使用CFbooleanreference并将其强制转换

[delegate performSelectorOnMainThread:@selector(setVariablePremierAffichage:) withObject:(id)kCFBooleanTrue waitUntilDone:NO];

Answer 3

无法将基元转换为id。如果需要动态调用方法，例如使用performSelector，则需要使用NSInvocation：

NSMethodSignature *sig = [self methodSignatureForSelector:@selector(setVariablePremierAffichage:)];
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:sig];
BOOL yes = YES;
[invocation setArgument:&yes atIndex:2];
[invocation setTarget:self];
[invocation setSelector:@selector(setVariablePremierAffichage:)];
[invocation invoke];

干杯！