Cocoa NSThread-获取布尔值

我试图通过NSThread获取

-（BOOL）backupDropletUpdateAvailable

返回的布尔值

为此，我尝试了以下方法：

`BOOL isAvailable=否

[NSThread detachNewThreadSelector:@selector(backupDropletUpdateAvailable) toTarget:isAvailable withObject:nil];

if (isAvailable == YES)
{//etc

它返回一个警告，因为BOOL是一个整数，

toTarget:

是一个指针。但是我怎样才能得到价值呢？如果我不在一个单独的线程上执行此操作，我的xib将在出现时滞后

---

谢谢：）

线程运行的方法需要写入关心结果的对象可以访问的位置。一种解决方案是让一个方法包装调用，获取结果，然后发布一个通知，将结果包含在用户信息中。然后，关心的对象可以处理通知。请注意，必须在线程启动之前创建对象，否则对象可能会错过通知

解决方案的示意图如下所示：

#define kDropletAvailabilityNotificationName @"com.myapp.notifications.DropletAvailability"

@implementation MyObject
- (void)registerNotifications {
    [[NSNotificationCenter defaultCenter]
     addObserver:self selector:@selector(dropletAvailabilityNotification:)
     name:kDropletAvailaibiltyNotificationName
     object:nil];
}

- (void)unregisterNotifications {
    [[NSNotificationCenter defaultCenter]
     removeObserver:self];
}

- (void)dropletAvailabilityNotification:(NSNotification *)note {
    NSNumber *boolNum = [note object];
    BOOL isAvailable = [boolNum boolValue];
    /* do something with isAvailable */
}

- (id)init {
    /* set up… */
    [self registerNotifications];
    return self;
}

- (void)dealloc {
    [self unregisterNotifications];
    /* tear down… */
    [super dealloc];
}
@end

@implementation CheckerObject
- (rsotine)arositen {
    /* MyObject must be created before now! */
    [self performSelectorInBackground:@selector(checkDropletAvailability) withObject:nil];
}

- (void)checkDropletAvailability {
    id pool = [[NSAutoreleasePool alloc] init];
    BOOL isAvailable = [self backupDropletUpdateAvailable];
    NSNumber *boolNum = [NSNumber numberWithBool:isAvailable];
    [[NSNotificationCenter defaultCenter]
     postNotificationName:kDropletAvailaibiltyNotificationName
     object:boolNum];
    [pool drain];
}

---

线程运行的方法需要写入关心结果的对象可以访问的位置。一种解决方案是让一个方法包装调用，获取结果，然后发布一个通知，将结果包含在用户信息中。然后，关心的对象可以处理通知。请注意，必须在线程启动之前创建对象，否则对象可能会错过通知

解决方案的示意图如下所示：

#define kDropletAvailabilityNotificationName @"com.myapp.notifications.DropletAvailability"

@implementation MyObject
- (void)registerNotifications {
    [[NSNotificationCenter defaultCenter]
     addObserver:self selector:@selector(dropletAvailabilityNotification:)
     name:kDropletAvailaibiltyNotificationName
     object:nil];
}

- (void)unregisterNotifications {
    [[NSNotificationCenter defaultCenter]
     removeObserver:self];
}

- (void)dropletAvailabilityNotification:(NSNotification *)note {
    NSNumber *boolNum = [note object];
    BOOL isAvailable = [boolNum boolValue];
    /* do something with isAvailable */
}

- (id)init {
    /* set up… */
    [self registerNotifications];
    return self;
}

- (void)dealloc {
    [self unregisterNotifications];
    /* tear down… */
    [super dealloc];
}
@end

@implementation CheckerObject
- (rsotine)arositen {
    /* MyObject must be created before now! */
    [self performSelectorInBackground:@selector(checkDropletAvailability) withObject:nil];
}

- (void)checkDropletAvailability {
    id pool = [[NSAutoreleasePool alloc] init];
    BOOL isAvailable = [self backupDropletUpdateAvailable];
    NSNumber *boolNum = [NSNumber numberWithBool:isAvailable];
    [[NSNotificationCenter defaultCenter]
     postNotificationName:kDropletAvailaibiltyNotificationName
     object:boolNum];
    [pool drain];
}