在 xCode 中找不到方法定义
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Method definition not found in xCode
提问by gbk
using xCode 5.1, Objective C
使用 xCode 5.1，目标 C
Just start to try use of Objective C, write a simple program, and got some Warning :
Method definition for "some method" not found...
刚开始尝试使用Objective C，编写一个简单的程序，并得到一些警告：
Method definition for "some method" not found...
I'm looking in to my code and i see method in implementation file (.m) Screen.
我正在查看我的代码，我在实现文件 (.m) 屏幕中看到了方法。
I know - see a lot of similar questions:
我知道 - 看到很多类似的问题：
- Here- differences in letter case - check all it's ok
- Here- calling to method that not exist in .m file - check - exist
- Here- same problem like in prev. question
- Here- weird/non-standard setup Apple - all OK
- Here- incorrect implementation
- Here- missed parameter, so incorrect implementation
- and other same errors...
- 在这里- 字母大小写的差异 - 检查一切正常
- 这里- 调用 .m 文件中不存在的方法 - 检查 - 存在
- 在这里- 与上一个相同的问题。题
- 在这里- 奇怪的/非标准设置 Apple - 一切正常
- 这里- 不正确的实现
- 这里- 缺少参数，所以不正确的实现
- 和其他相同的错误...
So according to this post, i think that the problem is or in missing declaration/implementation or some syntax's error
所以根据这篇文章，我认为问题在于缺少声明/实现或某些语法错误
Check my code looks like all is ok.
检查我的代码看起来一切正常。
Declaration - in .h file
声明 - 在 .h 文件中
//- mean non static method
//(return type) Method name : (type of var *) name of var
- (void)addAlbumWithTitle : (NSString *) title
//global name of var : (type of var *) local name of var
artist : (NSString *) artist :
summary : (NSString *) summary :
price : (float) price :
locationInStore : (NSString *) locationInStore;
Implementation in .m file
在 .m 文件中实现
- (void)addAlbumWithTitle:(NSString *)title
artist:(NSString *)artist
summary:(NSString *)summary
price:(float)price
locationInStore:(NSString *)locationInStore {
Album *newAlbum = [[Album alloc] initWithTitle:title
artist:artist
summary:summary
price:price
locationInStore:locationInStore];
[self.albumList addObject:newAlbum];
}
I'm just few a day like start to try Objective C with xCode, maybe I something missed
我只是一天开始尝试使用 xCode 尝试 Objective C，也许我错过了一些东西
回答by Salavat Khanov
The syntax is incorrect. Your .h should look like this for this method (remove extra colons):
语法不正确。对于此方法，您的 .h 应如下所示（删除多余的冒号）：
- (void)addAlbumWithTitle:(NSString *)title
artist:(NSString *)artist
summary:(NSString *)summary
price:(float)price
locationInStore:(NSString *)locationInStore;
Apple Docs:
苹果文档：
If you need to supply multiple parameters, the syntax is again quite different from C. Multiple parameters to a C function are specified inside the parentheses, separated by commas; in Objective-C, the declaration for a method taking two parameters looks like this:
- (void)someMethodWithFirstValue:(SomeType)value1 secondValue:(AnotherType)value2;In this example, value1 and value2 are the names used in the implementation to access the values supplied when the method is called, as if they were variables.
如果需要提供多个参数，语法又与 C 完全不同。C 函数的多个参数在括号内指定，用逗号分隔；在 Objective-C 中，带有两个参数的方法的声明如下所示：
- (void)someMethodWithFirstValue:(SomeType)value1 secondValue:(AnotherType)value2;在此示例中，value1 和 value2 是实现中用于访问调用方法时提供的值的名称，就好像它们是变量一样。
Refer to the documentation.
请参阅文档。
