这个语法在Objective

这个语法在Objective-C中意味着什么？(What does this syntax mean in Objective-C?)

考虑以下：

- (id)initWithTitle:(NSString *)newTitle boxOfficeGross:(NSNumber *)newBoxOfficeGross summary:(NSString *)newSummary;

这是什么意思？ 我已经猜到它会返回id，并且需要三个参数，但语法的每个部分是什么意思？ 我来自Ruby / JS背景，我觉得这个语法有点难以掌握。

Consider the following:

- (id)initWithTitle:(NSString *)newTitle boxOfficeGross:(NSNumber *)newBoxOfficeGross summary:(NSString *)newSummary;

What does this mean? I've guessed that it returns id, and takes three params, but what does each part of the syntax mean? I come from a Ruby/JS background and am finding this syntax a little hard to grasp.

最满意答案

它是一个名为initWithTitle:boxOfficeGross:summary:的实例方法（即，不是静态或“类”方法） initWithTitle:boxOfficeGross:summary:返回id类型的对象（泛型对象）。 它需要三个参数：String对象，Number对象和另一个String对象。

你这样调用它：

NSNumber * gross = [NSNumber numberWithInteger:1878025999] Movie * avatar = [[Movie alloc] initWithTitle:@"Avatar" boxOfficeGross:gross summary:@"Pocahontas in the 22nd century"]; //or you can do it all on one line, like so: Movie * avatar = [[Movie alloc] initWithTitle:@"Avatar" boxOfficeGross:gross summary:@"Pocahontas in the 22nd century"];

It's an instance method (ie, not a static or "class" method) called initWithTitle:boxOfficeGross:summary: that returns an object of type id (generic object). It takes three parameters: a String object, a Number object, and another String object.

You invoke it like this:

NSNumber * gross = [NSNumber numberWithInteger:1878025999] Movie * avatar = [[Movie alloc] initWithTitle:@"Avatar" boxOfficeGross:gross summary:@"Pocahontas in the 22nd century"]; //or you can do it all on one line, like so: Movie * avatar = [[Movie alloc] initWithTitle:@"Avatar" boxOfficeGross:gross summary:@"Pocahontas in the 22nd century"];