在Objective-C类中使用调试区域时，无法看到Swift对象层次结构 [英] Can't see Swift object hierarchy in debug area when used within Objective-C class

问题描述

我的问题可能很简单，但是我很失落。
任何评论，想法，帮助，预测都将如此有用。

这是我的课程

TrialSwiftClass.swift

  import Foundation 
 
 @objc public class TrialSwiftClass：NSObject {
 var first：String？ 
 var second：NSString？ 
 var third：NSNumber = 0 
 
 
 override init（）{
 super.init（）
} 
 
 init （data：NSArray）{
 
 self.first = data [0] as？ String 
 self.second = data [1] as？ NSString 
 self.third = data [2] as！ NSNumber 
} 
} 
  

TrialObjectiveCClass.h

  #import< Foundation / Foundation.h> 
 
 @interface TrialObjectiveCClass：NSObject 
 
 @property（nonatomic，strong）NSString * first; 
 @property（nonatomic，strong）NSString * second; 
 @property（nonatomic，assign）NSNumber * third; 
 
  - （instancetype）initWithArray：（NSArray *）数据; 
 
 @end 
  

TrialObjectiveCClass.m

  #importTrialObjectiveCClass.h
 
 @implementation TrialObjectiveCClass 
 
 
  - （instancetype）initWithArray：（NSArray *）data {
 self.first = data [0]; 
 self.second = data [1]; 
 self.third = data [2]; 
 
 return self; 
} 
 @end 
  

现在来问题。当我使用这些我的ViewController.m中有两个类，其中有以下代码：

  #importViewController.h
＃ importTrialObjectiveCClass.h
 #importCodemaster-Swift.h//自动创建的标题在Objective-C 
 
 
 @interface中的Swift代码ViewController（）
 
 @end 
 
 @implementation ViewController 
 
  - （void）viewDidLoad {
 [super viewDidLoad]; 
 
 NSArray * trialArray = @ [@FirstString，@SecondString，@ 99]; 
 
 
 //首先Swift部分
 TrialSwiftClass * obj = [[TrialSwiftClass alloc] initWithData：trialArray]; 
 
 NSLog（@％@，obj.first）; 
 NSLog（@％@，obj.second） 
 NSLog（@％@，obj.third）; 
 
 
 //现在Objective-C部分
 TrialObjectiveCClass * obj2 = [[TrialObjectiveCClass alloc] initWithArray：trialArray]; 
 NSLog（@％@，obj2.first）; 
 NSLog（@％@，obj2.second）; 
 NSLog（@％@，obj2.third）; 
 
 
} 
  

如果我在最后一个断点NSLog在ViewController.m中，这是我在调试区域看到的：

我的日志显示我的对象的属性的正确值。

为什么我不能看到我的Swift类的层次结构，但可以看到我的Objective-C类？如何解决这个问题？

解决方案

Swift类中的变量将暴露给ObjC作为属性。目前，本地图视图不显示对象的属性，只显示其ivars。无论课程来自ObjC还是Swift，都是如此。这就是为什么swift变量不会出现在本地视图中。

您可以使用lldb控制台中的expression命令查看对象的属性来解决此问题。例如，在您的示例中，您可以执行以下操作：

 （lldb）expr obj.first 
（__NSCFConstantString * ）$ 0 = 0x00000001002d1498 @FirstString
  

等。

My problem may be so simple but I'm so lost in it. Any comment, idea, help, prediction would be so useful.

Here are my classes

TrialSwiftClass.swift

import Foundation

@objc public class TrialSwiftClass : NSObject{
    var first : String?
    var second : NSString?
    var third : NSNumber = 0


    override init(){
        super.init()
    }

    init(data:NSArray){

            self.first = data[0] as? String
            self.second = data[1] as? NSString
            self.third = data[2] as! NSNumber
    }
}

TrialObjectiveCClass.h

#import <Foundation/Foundation.h>

@interface TrialObjectiveCClass : NSObject

@property (nonatomic, strong) NSString *first;
@property (nonatomic, strong) NSString *second;
@property (nonatomic, assign) NSNumber *third;

- (instancetype)initWithArray:(NSArray *)data;

@end

TrialObjectiveCClass.m

#import "TrialObjectiveCClass.h"

@implementation TrialObjectiveCClass


- (instancetype)initWithArray:(NSArray *)data{
    self.first = data[0];
    self.second = data[1];
    self.third = data[2];

    return self;
}
@end

Now here comes the problem.When I use these two classes in my ViewController.m which has following code in it:

#import "ViewController.h"
#import "TrialObjectiveCClass.h"
#import "Codemaster-Swift.h" //Automatically created header to use Swift code in Objective-C


@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    NSArray *trialArray = @[@"FirstString", @"SecondString", @99];


    //First the Swift part
    TrialSwiftClass *obj = [[TrialSwiftClass alloc] initWithData:trialArray];

    NSLog(@"%@", obj.first);
    NSLog(@"%@", obj.second);
    NSLog(@"%@", obj.third);


    //Now the Objective-C part
    TrialObjectiveCClass *obj2 = [[TrialObjectiveCClass alloc] initWithArray:trialArray];
    NSLog(@"%@", obj2.first);
    NSLog(@"%@", obj2.second);
    NSLog(@"%@", obj2.third);


}

If I put a breakpoint in the last NSLog in ViewController.m, here is what i see in debug area:

My logs are showing the right value of my object's properties.

Why can't i see the hierarchy of my Swift class but can see my Objective-C class? How to solve this problem?

解决方案

The variables in your Swift class get exposed to ObjC as properties. At present the Locals view does not show the properties of an object, only its ivars. This is true regardless of whether the class comes from ObjC or Swift. That's why the swift variables don't show up in the locals view.

You can work around this by using the expression command in the lldb console to view the object's properties. For instance, stopped in your example, you can do:

(lldb) expr obj.first
(__NSCFConstantString *) $0 = 0x00000001002d1498 @"FirstString"

etc.

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