如何将数组值从一个类传递到另一类 [英] How to pass array value from one class to other class

问题描述

如何从委托类传递数组值到视图控制器类

How can i pass an array value from a delegate class to view controller class

const char *query2=[tempQuery UTF8String];
NSMutableArray *arr1 = [[NSMutableArray alloc]init];;
if (sqlite3_prepare_v2(database,query2,-1,&statement1,NULL)==SQLITE_OK) {
    //NSLog(@"vt", vt);

    while (sqlite3_step(statement1)==SQLITE_ROW) {
        vt=[[[Question1 alloc]init]autorelease];
        vt.question=[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement1,3)];
        [arr1 addObject:vt.question];
        NSLog(@"arr1 is %@",[arr1 description]);

其中arr1是数组值.因此该数组值必须传入另一个类.

Where arr1 is an array value. So that array value has to pass in another class.

谢谢.

推荐答案

您可以使用 NSUserDefault 方法传递 NSString 或 NSMutableArray ... NSUserDefaultExample 和

You can pass NSString or NSMutableArray using NSUserDefault method... NSUserDefaultExample and Saving/Retrieving Data Using NSUserDefaults

保存

 NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];

// saving an NSString
[prefs setObject:@"TextToSave" forKey:@"keyToLookupString"];

 // saving an NSInteger
 [prefs setInteger:42 forKey:@"integerKey"];

 // saving a Double
 [prefs setDouble:3.1415 forKey:@"doubleKey"];

 // saving a Float
 [prefs setFloat:1.2345678 forKey:@"floatKey"];

  // saving an array
  NSData *data = [NSKeyedArchiver archivedDataWithRootObject:array];
  [prefs setObject:data forKey:@"lastResults"]

 // This is suggested to synch prefs, but is not needed (I didn't put it in my tut)
 [prefs synchronize];

用于检索

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];

// getting an NSString
NSString *myString = [prefs stringForKey:@"keyToLookupString"];

// getting an NSInteger
NSInteger myInt = [prefs integerForKey:@"integerKey"];

// getting an Float
float myFloat = [prefs floatForKey:@"floatKey"];

// getting an array
 NSData *dataRepresentingSavedArray = [prefs objectForKey:@"lastResults"];
 if (dataRepresentingSavedArray != nil)
 {
    NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingSavedArray];
    if (oldSavedArray != nil)
            objectArray = [[NSMutableArray alloc] initWithArray:oldSavedArray];
    else
            objectArray = [[NSMutableArray alloc] init];
 }

或

filename *detailViewController = [[filename alloc] initWithNibName:@"filename" bundle:nil];
detailViewController.audio=@"yourData";
[self presentModalViewController:detailViewController animated:YES];
[detailViewController release];

在filename.h中声明

Declare in filename.h

 NSArray *audio;

 @property(nonatomic,retain) NSArray *audio;

和文件名.m

 @synthesize audio;

仅此而已.

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