iOS 如何实现具有多个参数和 afterDelay 的 performSelector

发布于04月02日

我是iOS新手.我有一个 Select 器方法如下-

- (void) fooFirstInput:(NSString*) first secondInput:(NSString*) second
{

}

我正试着实施这样的事情-

[self performSelector:@selector(fooFirstInput:secondInput:) withObject:@"first" withObject:@"second" afterDelay:15.0];

但这给了我一个错误，说-

Instance method -performSelector:withObject:withObject:afterDelay: not found

你知道我错过了什么吗？

推荐答案

就我个人而言，我认为更能满足您需求的解决方案是使用NSInacation.

下面这样的代码就可以完成这项工作:

indexPath和dataSource是在同一方法中定义的两个实例变量.

SEL aSelector = NSSelectorFromString(@"dropDownSelectedRow:withDataSource:");

if([dropDownDelegate respondsToSelector:aSelector]) {
    NSInvocation *inv = [NSInvocation invocationWithMethodSignature:[dropDownDelegate methodSignatureForSelector:aSelector]];
    [inv setSelector:aSelector];
    [inv setTarget:dropDownDelegate];

    [inv setArgument:&(indexPath) atIndex:2]; //arguments 0 and 1 are self and _cmd respectively, automatically set by NSInvocation
    [inv setArgument:&(dataSource) atIndex:3]; //arguments 0 and 1 are self and _cmd respectively, automatically set by NSInvocation

    [inv invoke];
}