调用方法的两种方法

1.第一种：这种方法最多只能接受两个参数

- (id)performSelector:(SEL)aSelector;

- (id)performSelector:(SEL)aSelector withObject:(id)object;

- (id)performSelector:(SEL)aSelector withObject:(id)object1 withObject:(id)object2;

 [self performSelector:@selector(selector1:) withObject:@"123" afterDelay:1];

-(void)selector1:(NSString*)object{

    NSLog(@"参数= %@",object);

}

//第二种方法

  NSString* str1 =@"a";

    NSString* str2 =@"b";

    NSString* str3 =@"c";

    NSMethodSignature* sign = [selfmethodSignatureForSelector:@selector(personInfo:age:gender:)];

    NSInvocation * invocation = [NSInvocation invocationWithMethodSignature:sign];

    [invocationsetTarget:self];

    [invocationsetSelector:@selector(personInfo:age:gender:)];

    [invocationsetArgument:&str1atIndex:2];

    [invocationsetArgument:&str2atIndex:3];

    [invocationsetArgument:&str3atIndex:4];

    [invocation invoke];

-(void)personInfo:(NSString*)info age:(NSString*)age gender:(NSString*)gender{

    NSLog(@"info = %@ age = %@ gender = %@",info,age,gender);

}

注意：参数是从第二个位置开始的，因为0为self，1位为selector

(lldb) po invocation

<NSInvocation: 0x60000027e980>

return value: {v} void

target: {@} 0x7fd1bd71ca30

selector: {:} personInfo:age:gender:

argument 2: {@} 0x103c073e0

argument 3: {@} 0x103c07400

argument 4: {@} 0x103c07420