如何释放静态类的属性

Question

我有一个静态类女巫有两个属性，如下面......

   @interface Global : NSObject
    {

        BarcodeScanner* scanner;
        NSInteger warehouseID;
    }

    @property(assign) BarcodeScanner* scanner;
    @property(assign) NSInteger warehouseID;


    +(Global *)sharedInstance;

    @end

---

    #import "Global.h"

    @implementation Global
    @synthesize scanner,warehouseID;

    + (Global *)sharedInstance
    {

        static Global *globalInstance = nil;

        if (nil == globalInstance) {
            globalInstance  = [[Global alloc] init];

            globalInstance.scanner = [[BarcodeScanner alloc] init];

            globalInstance.warehouseID = 1;
        }

        return globalInstance;
    }

    -(void) dealloc
    {
        [super dealloc];
    }

@end

现在，当我在Xcode中分析项目时，我收到了扫描器和仓库ID属性的内存泄漏警告，当我尝试以dealloc方法释放它们时... ...

[[[Global sharedInstance] scanner]release];

我收到警告“对象引用计数的错误减少......”

我应该如何解决这个问题。

非常感谢您的帮助。

Answer 1

警告是因为您的代码与Analyzer使用的规则不匹配。为了避免警告

1. 使扫描仪属性保留
2. 将实例化或BarcodeScanner更改为自动释放
3. 在dealloc
中为扫描程序添加一个版本

示例（重新格式化以节省空间）：

@class BarcodeScanner;
@interface Global : NSObject {
    BarcodeScanner* scanner;
    NSInteger warehouseID;
}
@property(retain) BarcodeScanner* scanner;
@property(assign) NSInteger warehouseID;

+(Global *)sharedInstance;
@end

@implementation Global
@synthesize scanner,warehouseID;

+ (Global *)sharedInstance {
    static Global *globalInstance = nil;

    if (nil == globalInstance) {
        globalInstance  = [[Global alloc] init];
        globalInstance.scanner = [[[BarcodeScanner alloc] init] autorelease];
        globalInstance.warehouseID = 1;
    }
     return globalInstance;
}

-(void) dealloc {
    [scanner release];
    [super dealloc];
}
@end

Answer 2

将它留给自动释放池

  

globalInstance.scanner = [[[BarcodeScanner alloc] init] autorelease];