类方法和“在线分配的对象的潜在泄漏...”

发布于 2024-12-12 03:45:53 字数 709 浏览 0 评论 0原文

我遇到这种情况：

- (void) foo {
    NSLog(@"Print this: %@", [MyObject classString]);
}

// So in MyObject.m I do
@implementation MyObject

+ (NSString *) classString {
     return [OtherObject otherClassString];   //The Warning "Potential leak..." is for this line
}
@end

// Finally in OtherObject
@implementation OtherObject

+ (NSString *) otherClassString {
    NSString *result = [[NSString alloc] initWithString:@"Hello World"];
    return result;
}
@end

一开始，我对 otherClassString 和 classString 发出警告，但通过这种方式 otherClassString 这项工作。

现在我的问题出在 MyObject 的 classString 中。我尝试了很多方法，但总是显示此警告。我不能在类方法中调用类方法吗？

原文

I have this situation:

- (void) foo {
    NSLog(@"Print this: %@", [MyObject classString]);
}

// So in MyObject.m I do
@implementation MyObject

+ (NSString *) classString {
     return [OtherObject otherClassString];   //The Warning "Potential leak..." is for this line
}
@end

// Finally in OtherObject
@implementation OtherObject

+ (NSString *) otherClassString {
    NSString *result = [[NSString alloc] initWithString:@"Hello World"];
    return result;
}
@end

In the beginning, I had a warning for otherClassString and for classString but with this way for otherClassString this work.

Now my problem is in classString in the MyObject. I tried a lot of things, but this warning is always shown. Can't I call a class method inside a class method?

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殊姿 2024-12-19 03:45:53

您的 +otherClassString 创建一个保留计数为 1 的对象并返回它。这也用作 +classString 的返回值。

如果您的方法不是以 init、new 或 copy 开头，则应返回自动释放的对象。在任何使用您的（按原样）的地方，它们都应该返回一个自动释放的对象。

+ (NSString *) otherClassString {
    NSString *result = [[[NSString alloc]
                            initWithString:@"Hello World"]
                            autorelease];
    return result;
}

Your +otherClassString creates an object with retain count 1 and returns it. This is used as return value for +classString as well.

If your methods don't begin with init, new, or copy, you should return autoreleased objects. Everywhere where yours (as is) are used, they'll be expected to return an autoreleased object.

+ (NSString *) otherClassString {
    NSString *result = [[[NSString alloc]
                            initWithString:@"Hello World"]
                            autorelease];
    return result;
}

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⒈起吃苦の倖褔 2024-12-19 03:45:53

您的问题归结为：您有一个方法，根据命名约定，该方法应该返回自动释放的对象，但它返回保留的对象。该方法是+otherClassString。将其更改为以下内容：

+ (NSString *)otherClassString {
    NSString *result = [[NSString alloc] initWithString:@"Hello World"];
    return [result autorelease];
}

Your problem boils down to this: You have a method which, by the naming conventions, should be returning an autoreleased object but instead it's returning a retained object. That method is +otherClassString. Change it to the following:

+ (NSString *)otherClassString {
    NSString *result = [[NSString alloc] initWithString:@"Hello World"];
    return [result autorelease];
}

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往事风中埋 2024-12-19 03:45:53

我已经准确地重现了您的场景，没有发生错误或警告。也许您的头文件有问题。这是我的代码（Xcode 4.2 和 iOS5）：

// myObject.h
#import <Foundation/Foundation.h>
#import "otherObject.h"

@interface myObject : NSObject

+ (NSString *) classString;
@end
// --------------------------
// myObject.m
#import "myObject.h"
@implementation myObject

+ (NSString *) classString {
    return [otherObject otherClassString];   
}

@end

// otherObject.h
#import <Foundation/Foundation.h>

@interface otherObject : NSObject

+ (NSString *) otherClassString;

@end

// otherObject.m
#import "otherObject.h"

@implementation otherObject

+ (NSString *) otherClassString {
    NSString *result = [[NSString alloc] initWithString:@"Hello World"];
    return result;
}

@end
// --------------------------

I have reproduced your scenario exactly and no errors or warnings occurs. Maybe you have an issue on your header files. Here’s my code (Xcode 4.2 and iOS5):

// myObject.h
#import <Foundation/Foundation.h>
#import "otherObject.h"

@interface myObject : NSObject

+ (NSString *) classString;
@end
// --------------------------
// myObject.m
#import "myObject.h"
@implementation myObject

+ (NSString *) classString {
    return [otherObject otherClassString];   
}

@end

// otherObject.h
#import <Foundation/Foundation.h>

@interface otherObject : NSObject

+ (NSString *) otherClassString;

@end

// otherObject.m
#import "otherObject.h"

@implementation otherObject

+ (NSString *) otherClassString {
    NSString *result = [[NSString alloc] initWithString:@"Hello World"];
    return result;
}

@end
// --------------------------

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