Question

您好我是iPhone开发的新手。我尝试将NSDictionary中的移动数据添加到我创建的调用的数据成员中。当我“setWeightMeasure”没有发生任何事情。

有什么建议吗？

不起作用的代码：

NSDictionary *responseBodyProfile = [responseBody objectFromJSONString];
NSLog(@"%@",responseBodyProfile);
// the output is : 
"{ "profile": {"goal_weight_kg": "77.0000", "height_cm": "179.00", 
  "height_measure": "Cm", "last_weight_date_int": "15452", 
   "last_weight_kg": "99.0000", "weight_measure": "Kg" }}""

[responseBody release];

if (responseBodyProfile != nil ){
    NSDictionary *profile =[responseBodyProfile valueForKey:@"profile"];

    NSLog(@"%@\n",[profile objectForKey:@"weight_measure"]);// Output : "kg"

    [self.myUser setWeightMeasure:[profile objectForKey:@"weight_measure"]];
    NSLog(@"%@", [self.myUser WeightMeasure]); // Output : "(null)"
 }

H档案：

@property (nonatomic, retain) UserData* myUser;

UserData.h：

#import <Foundation/Foundation.h>

@interface UserData : NSObject{
    NSString* Weight;
    NSString* Height;
    NSString* GolWeight;
    NSString* WeightMeasure;

}

@property (nonatomic, retain) NSString* Weight;
@property (nonatomic, retain) NSString* Height;
@property (nonatomic, retain) NSString* GolWeight;
@property (nonatomic, retain) NSString* WeightMeasure; 

@end

UserData.m

#import "UserData.h"

@implementation UserData
@synthesize Weight, Height, GolWeight, WeightMeasure;

-(id)init{
    self.Weight = @"0";
    self.Height = @"0";
    self.GolWeight = @"0";
    self.WeightMeasure = @"0";
    return self;
}

-(void)dealloc{
    [Weight release];
    [Height release];
    [GolWeight release];   
    [WeightMeasure release];

    [super dealloc];
}

@end

Answer 1

在此行中使用valueForKey而不是objectForKey：

[self.myUser setWeightMeasure:[profile objectForKey:@"weight_measure"]];

像这样：

[self.myUser setWeightMeasure:[profile valueForKey:@"weight_measure"]];

您可能还想使用，因为这些值可以读作NSNumbers

[self.myUser setWeightMeasure:[[profile valueForKey:@"weight_measure"] stringValue]];

为什么你使用字符串而不是浮点数？当您需要进行一些比较时，这会不会让您的生活更轻松？

同时检查你是否为＆＃34; myUser＆＃34;分配了内存，也可能是这种情况。

Answer 2

正如Eugene所提到的，你应该使用valueForKey而不是objectForKey

另一件事是，当你引用你的对象成员时，你可能想要使用属性和点符号，正如Apple建议的那样。管理记忆通常对你有好处。

关于不在你的-init（）中初始化你的字符串成员的前一个答案是完全错误的，如果这会导致一些混乱，我为它道歉。

将数据添加到我的数据成员

2 个答案: