方法调用的参数过多 [英] Too many arguments to method call

问题描述

我正在尝试使用来自appDelegate的NSString设置Twitter消息应在我的应用中说的内容的初始文本。在此处查看代码：

I am trying to set the initial text for what the twitter message should say in my app using a NSString from my appDelegate. Check out the code here:

    NSString *tweet;
tweet=[MyWebFunction tweet:appDelegate.stadium_id];


if([deviceType hasPrefix:@"5."]){

    // Create the view controller
    TWTweetComposeViewController *twitter = [[TWTweetComposeViewController alloc] init];

    [twitter setInitialText:@"@%",tweet];

问题是，twitter setInitialText上是否存在错误，即方法有太多参数呼叫，预期1，有2。？！？！？

The problem is, is there is an error at the twitter setInitialText that there are Too many arguments to method call, expected 1, have 2. ?!?!?

任何帮助将不胜感激。 ：）

Any help is greatly appreciated. :)

推荐答案

仅 TWTweetComposeViewController 方法 setInitialText 接受一个参数，类型为 NSString * 。您不能使用 NSString 方法<$ c $来简单格式化传递给方法的任何和所有 NSString 变量。 c> stringWithFormat （我想这是您看到的语法 [NSString stringWithFormat：@％@，myString] ） 。

The TWTweetComposeViewController method setInitialText only takes one argument, being of type NSString*. You cannot simply format any and all NSString variables passed to a method as you can with the NSString method stringWithFormat (which is, I imagine, where you've seen the syntax [NSString stringWithFormat:@"%@", myString]).

在您的情况下，您只需简单地致电：

In your case, you either need to simply call:

[twitter setInitialText:tweet];

或致电：

[twitter setInitialText:[NSString stringWithFormat:@"%@", tweet]]

编辑

为了使您进一步理解，我认为有必要添加一个方法仅接受可变数量的参数（例如 stringWithFormat ），当其声明以 ...

结尾时，例如 NSString 的文档显示， stringWithFormat 的声明如下：

For example, looking in the docs for NSString reveals that stringWithFormat is declared as such:

+(id) stringWithFormat:(NSString *)format, ...;

类似地，<$ c $中的 arrayWithObjects c> NSArray 这样声明：

Similarly, arrayWithObjects in NSArray is declared as such:

+(id) arrayWithObjects:(id)firstObj, ...;

一个人会这样使用：

NSString* myString1 = @"foo";
NSString* myString2 = @"bar";
NSNumber* myNumber = [NSNumber numberWithInt:42];
NSArray* myArray = [NSArray arrayWithObjects:myString1, myString2, myNumber, nil];

这篇关于方法调用的参数过多的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！