Question

我有一个具有一些属性的单例对象，我想将所有这些值设置为nil或＆＃34; NO＆＃34;基于属性的类型。一种方法是编写一个重置方法，我将所有这些属性设置为nil，就像下面一样。

这甚至可能包含要清除的实例变量。

-(void)reset
{
    //Properties
    self.lastLoggedInUser = nil;
    self.localMasterDownload = NO;
    self.isFirstLaunchDone = NO;
    self.lastArchvingDate = nil;
    self.archivingDueDate = nil;
    self.dbEncryptionKey = nil;
    self.checkInDone = NO;
    //Instance variables
    _isPostionModuleExtandedMode = NO;
    _isPassengerModuleExtandedMode = NO;
}

但我正在寻找一种更通用，更有效的方法。

感谢任何帮助。

感谢。

Answer 1

这将为您提供类属性，从那里您只需要将键字符串转换为可以将属性转换为nil的内容。我认为这是可能的。

NSMutableDictionary *dict = [NSMutableDictionary dictionary];

unsigned count;
objc_property_t *properties = class_copyPropertyList([self class], &count);

for (int i = 0; i < count; i++) {
    NSString *key = [NSString stringWithUTF8String:property_getName(properties[i])];
    if([self valueForKey:key]!=nil){
        [dict setObject:[self valueForKey:key] forKey:key];


    }else{
        [dict setObject:@NO forKey:key];

    }
}

free(properties);

return [NSDictionary dictionaryWithDictionary:dict];

Answer 2

- (void) resetProperties {
    unsigned int outCount, i;
    objc_property_t *properties = class_copyPropertyList([self class], &outCount);
    for(i = 0; i < outCount; i++) {
        objc_property_t property = properties[i];
        const char *propName = property_getName(property);
        if(propName) {
            NSString *propertyName = [NSString stringWithCString:propName encoding:[NSString defaultCStringEncoding]];

            id value = [self valueForKey:propertyName];
            NSLog(@"[berore]XXXresetProperties => [%@] %@=%@", [propertyName class],propertyName, value);

            /* You can add some other checks */
            if ([value isKindOfClass:[NSNumber class]]) {
                [self setValue:[NSNumber numberWithInteger:0] forKeyPath:propertyName];
            }
            if ([value isKindOfClass:[NSString class]]) {
                [self setValue:nil forKeyPath:propertyName];
            }
            if ([value isKindOfClass:[NSDictionary class]]) {
                [self setValue:nil forKeyPath:propertyName];
            }

            id valueRes = [self valueForKey:propertyName];
            NSLog(@"[after]XXXresetProperties => [%@] %@=%@\n---\n", [propertyName class],propertyName, valueRes);
        }
    }
    free(properties);
}

你可以在那里得到它： https://github.com/energy6x6/iOS-clear-all-property-in-class

如何将NSObject的所有属性设置为nil而不必明确指定所有属性。

2 个答案: