从其他类访问NSMutableArray [英] Access NSMutableArray from a different class
问题描述
我有一个类,其中形成了一个NSMutableArray对象,如下所示:
I have a class where a NSMutableArray object is formed, as so:
navBarColour = [[NSMutableArray alloc] initWithObjects:colourOfNavBar, nil];
然后我有另一个类,它正确地添加了第一个类,但它不会让我从第一个类访问NSMutableArray。这行代码:
I then have another class, which has the first class added to it properly, but it won't let me access the NSMutableArray from the first class. This line of code:
NSLog(@"%@", [HandlingPalettes.navBarColour objectAtIndex:0]);
退货:
预期':'在'。'标记之前
expected ':' before '.' token
但是:
NSLog(@"%@", [navBarColour objectAtIndex:0]);
可以在原始班级中使用。
would work in the original class.
我在这里做错了什么?
推荐答案
点符号在c ++或java的目标c中的使用方式不同。在objective-c中,它是访问属性的简写。你需要首先定义一个objective-c属性,如下所示:
The dot notation is used differently in objective c that from c++ or java. In objective-c it is shorthand for accessing a property. You need to have defined a objective-c property first, like this:
在.h文件中(INSIDE接口标记)
in the .h file (INSIDE the interface tag)
@property (nonatomic, retain) NSMutableArray *navBarColor;
(在实施标签内)
@synthesize navBarColor;
只有这样才能使用点表示法访问数组。
Only then can you access the array with the dot notation.
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