本文介绍了属性也声明为实例变量吗?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
此代码有效:
@interface StringStuff : NSObject {
}
@property (nonatomic, retain) NSString *String1;
@property (nonatomic, retain) NSString *String2;
- (NSString *) doSomethingWithStrings;
@end
但是我经常看到:
@interface StringStuff : NSObject {
NSString *String1;
NSSTring *String2;
}
@property (nonatomic, retain) NSString *String1;
@property (nonatomic, retain) NSString *String2;
- (NSString *) doSomethingWithStrings;
@end
是否也经常将属性声明为实例变量?它只是被认为是好的形式吗?
Is there a reason that properties are often declared as an instance variable as well? Is it just considered good form?
推荐答案
旧版;过去(现在仍然在32位Mac OS X目标代码上)需要ivar声明.在iOS,模拟器和64位OS X上不再如此.
Legacy; it used to be (and still is on 32 bit Mac OS X targeted code) that the ivar declarations were required. That is no longer true on iOS, the simulator and 64 bit OS X.
请注意,在确实需要self.iVar
的情况下,@synthesize iVar = iVar_;
可以防止意外的直接访问.
Note that it is common to @synthesize iVar = iVar_;
to prevent accidental direct access where self.iVar
is really required.
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