覆盖设置器方法并获取"xxx的本地声明隐藏实例变量". [英] Override setter method and get "Local declaration of xxx hides instance variable"

问题描述

我有一个整数变量，例如timeSignature，在.h文件中声明了它，并合成了一对setter/getter方法:

I have a integer variable, for example, timeSignature, declared it in .h file, and synthesized a pair of setter/getter methods:

在.h中:

@interface Metronome : NSObject {
    int timeSignature;
}
@property (nonatomic) int timeSignature;

在.m中:

@synthesize timeSignature;

我希望重写setter方法:当用户为其设置一个新值时，它会执行其他操作以及更改为新值:

I wish to override the setter method: when user set a new value to it, it does something else as well as changing to new value:

- (void) setTimeSignature:(int)timeSignature {
    self.timeSignature = timeSignature; //hides instance variable warning at this line
    [self doesSomethingElse];
}

这就是问题所在，局部变量和实例变量具有相同的名称.

And heres the problem, the local variable and the instance variable have the same name.

如何避免这种情况?

推荐答案

命名您的ivar _timeSignature并命名为@synthesize timeSignature = _timeSignature;

Name your ivar _timeSignature and make @synthesize timeSignature = _timeSignature;

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