在NSThread问题上调用带有两个参数的选择器

Question

我想用多个参数创建一个Thread.可能吗？我有这个功能:

-(void) loginWithUser:(NSString *) user password:(NSString *) password {
}

我想将此函数称为选择器:

[NSThread detachNewThreadSelector:@selector(loginWithUser:user:password:) toTarget:self withObject:@"someusername" withObject:@"somepassword"]; // this is wrong

如何在这个detachNewThreadSelect函数上传递onObject参数的两个参数？

可能吗？

Answer 1

您需要在传递给withObject的对象中传递额外的参数,如下所示:

NSDictionary *extraParams = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"user",@"password",nil] andKeys:[NSArray arrayWithObjects:@"valueForUser",@"valueForPassword",nil]]

[NSThread detachNewThreadSelector:@selector(loginWithUser:) toTarget:self withObject:extraParams]; 

Answer 2

这是我的头脑,未经测试:

NSThread+ManyObjects.h:

@interface NSThread (ManyObjects)

+ (void)detachNewThreadSelector:(SEL)aSelector
                       toTarget:(id)aTarget 
                     withObject:(id)anArgument
                      andObject:(id)anotherArgument;

@end

NSThread+ManyObjects.m:

@implementation NSThread (ManyObjects)

+ (void)detachNewThreadSelector:(SEL)aSelector
                       toTarget:(id)aTarget 
                     withObject:(id)anArgument
                      andObject:(id)anotherArgument
{
    NSMethodSignature *signature = [aTarget methodSignatureForSelector:aSelector];
    if (!signature) return;

    NSInvocation* invocation = [NSInvocation invocationWithMethodSignature:signature];
    [invocation setTarget:aTarget];
    [invocation setSelector:aSelector];
    [invocation setArgument:&anArgument atIndex:2];
    [invocation setArgument:&anotherArgument atIndex:3];
    [invocation retainArguments];

    [self detachNewThreadSelector:@selector(invoke) toTarget:invocation withObject:nil];
}

@end

然后你可以导入NSThread+ManyObjects和调用

[NSThread detachNewThreadSelector:@selector(loginWithUser:user:password:) toTarget:self withObject:@"someusername" andObject:@"somepassword"];