如何释放静态类的属性

Question

我有一个静态类，它有两个属性，像下面…

   @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，我得到了扫描仪和warehouseID属性的内存泄漏警告，当我试图在dealloc方法中释放它们时，如…

[[[Global sharedInstance] scanner]release];

i得到警告"不正确地递减对象的引用计数…"

我该如何解决这个问题?

所以谢谢你的帮助。

Answer 1

此警告是因为您的代码与Analyzer使用的规则不匹配。避免警告

1. 使扫描仪属性保留
2. 将barcodesscanner的实例化更改为自动释放
3. 在dealloc中为扫描仪添加释放

示例(为了节省空间而重新格式化):

@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

把它留给自动发布池

globalInstance。[[[BarcodeScanner alloc] init] autorelease];