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锁的相关介绍可以参照:http://blog.csdn.net/lifengzhong/article/details/7487505看NSConditionLock类的属性方法:lock,unlock:加锁和解锁,是required method。- (id)initWithCondition:(NSInteger)condition :初始化对象。有一个整形的conditon参数,表示条件。- (void)lockWhenCondition:(NSInteger)condition :“The receiver’s condition must be equal to condition 阅读全文
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当用到coredata的时候,当你存数据: NSManagedObject *oneObject = [NSEntityDescription insertNewObjectForEntityForName:@"DrawData" inManagedObjectContext:managedObjectContext]; [oneObject setValue:data.backGroundImageURL forKey:@"backGroundImageURL"]; [oneObject setValu... 阅读全文