开发中从后台请求数据，返回如下：
2014-12-05 16:44:52.535 掌麦[6984:613] getDefaultAddress: reuslt == { item = { data = { address = "<null>"; area = "<null>"; city = "<null>"; name = ""; phone = 18503051318; PRovince = "<null>"; }; mark = 1; msg = "/U6210/U529f"; }; status = 1;}我直接解析出字典dic，赋值：
[objc] view plain copy
<span style="font-size:18px;"> NSString *address = [dic objectForKey:@"address"]; //NSString *area = [dic objectForKey:@"area"]; NSString *name = [dic objectForKey:@"name"]; //NSString *city = [dic objectForKey:@"city"]; NSString *phone = [dic objectForKey:@"phone"]; //NSString *province = [dic objectForKey:@"province"]; self.addressLabel.text = address; self.nameLabel.text = name; self.phoneLabel.text = phone; </span> %20结果报错：CRASH:%20-[NSNull%20length]:%20unrecognized%20selector%20sent%20to%20instance<span style="font-size:18px;"> if (![address isKindOfClass:[NSNull class]]) { self.addressLabel.text = address; } if (![name isKindOfClass:[NSNull class]]) { self.nameLabel.text = name; } if (![phone isKindOfClass:[NSNull class]]) { self.phoneLabel.text = phone; } </span> 这样就OK了新闻热点
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