objective-c - 将数据从一个类移动到另一个类 - 同一个应用程序

Question

这里需要真正的帮助!!!

我正在尝试在第二类中使用在第一类中创建的数据。我已经搜索 Youtube 和 StackOverflow 超过 1 周了。每当我认为我已经很接近时，就会缺少一些我无法把握的元素。我的最新尝试来自于 2011 年发布的这个网站(在 Objective-c 类之间传递数据)，当应用程序编译时，我看不到第二类中的数据。

更具体。我使用 2 个类，因为数据收集在用户选择的组(第 1 类)中，并将在屏幕上显示在第 2 类的表格中。有 6 个 NSMutable 数组从源传递到第二类中的 6 个不同的数组。我将继续尝试解决，但我需要帮助。

以下是我根据 2011 年文章设计的内容:

一级.h代码(部分):

#import <Cocoa/Cocoa.h>
#import <Foundation/Foundation.h>
#import "ReportsOutput.h"

//@class AppDelegate;

@class ReportsOutput;




@interface ReportsClass : NSWindowController<NSApplicationDelegate,NSMenuDelegate,NSWindowDelegate>{

    ReportsOutput *ro;


    //Shared Data arrays

    NSMutableArray *tblYrScott;
    NSMutableArray *tblYrExt;
    NSMutableArray *tblYrYear;
    NSMutableArray *tblYrType;
    NSMutableArray *tblYrPrice;
    NSMutableArray *tblYrDescription;

...... added code

@property(nonatomic,retain)NSMutableArray *tblYrScott;
@property(nonatomic,retain)NSMutableArray *tblYrExt;
@property(nonatomic,retain)NSMutableArray *tblYrType;
@property(nonatomic,retain)NSMutableArray *tblYrYear;
@property(nonatomic,retain)NSMutableArray *tblYrPrice;
@property(nonatomic,retain)NSMutableArray *tblYrDescription;

一级 .m 代码:​​

- (IBAction)btnShowDataOutput:(id)sender {

    //pass data from Reports Class to Report Output Class

    ReportsOutput *objReportsOutput = [[ReportsOutput alloc]init];

    [objReportsOutput.tblScott setArray: tblYrScott];

    [objReportsOutput.tblExt setArray:tblYrDescription];

    [objReportsOutput.tblYear setArray:tblYrYear];

    [objReportsOutput.tblType setArray:tblYrType];

    [objReportsOutput.tblDescription setArray:tblYrDescription];

    // open Reports Output Window

    if (ro == nil){

        ro = [[ReportsOutput alloc] initWithWindowNibName:@"ReportsOutput"];

    }

    [ro showWindow:nil];
}

第二类.h代码:

#import <Cocoa/Cocoa.h>
#import "ReportsClass.h"


@interface ReportsOutput : NSWindowController{

   //shared data arrays
    NSMutableArray *tblScott;
    NSMutableArray *tblExt;
    NSMutableArray *tblYear;
    NSMutableArray *tblType;
    NSMutableArray *tblPrice;
    NSMutableArray *tblDescription;


}


@property(nonatomic,strong) NSMutableArray *tblScott;
@property(nonatomic,strong) NSMutableArray *tblExt;
@property(nonatomic,strong) NSMutableArray *tblYear;
@property(nonatomic,strong) NSMutableArray *tblType;
@property(nonatomic,strong) NSMutableArray *tblPrice;
@property(nonatomic,strong) NSMutableArray *tblDescription;


@end

二级 .m 代码:​​

#import "ReportsOutput.h"
//#import "ReportsClass.h"

@interface ReportsOutput ()


@end

@implementation ReportsOutput

@synthesize tblScott;
@synthesize tblExt;
@synthesize tblType;
@synthesize tblPrice;
@synthesize tblYear;
@synthesize tblDescription;


- (void)windowDidLoad {
    [super windowDidLoad];

}

-(void)awakeFromNib{

    [self dataCheck];
}

-(void)dataCheck{

    int a;

    for (a=0; a<[self.tblScott count]; a++){


        NSLog(@"@i,%d :%@: %@: %@: %@: %@: %@",a,[tblScott objectAtIndex:a],[tblExt objectAtIndex:a],[tblYear objectAtIndex:a],[tblType objectAtIndex:a],[tblPrice objectAtIndex:a],[tblDescription objectAtIndex:a]);

}
}

Answer 1

在 btnShowDataOutput 中，您创建了 objReportsOutput，但该对象会在方法结束后立即消失。您不需要创建 objReportsOutput。相反，直接在 ReportsOutput 窗口 Controller 上设置属性:

if (ro == nil){

    ro = [[ReportsOutput alloc] initWithWindowNibName:@"ReportsOutput"];
}

ro.tblScott = self.tblYrScott
ro.tblExt = self.tblYrExt
ro.tblYear = self.tblYrYear
ro.tblType = self.tblYrType
ro.tblDescription = self.tblYrDescription

[ro showWindow:nil];