iPhone Dev-從Plist編輯數組中的對象

Question

我有一個Plist，其中有多個Array。 在這些數組中，我正在讀取不同的對象，但是在編輯數組中的這些對象然后將數組再次保存回Plist文件時，我陷入了困境。

我已經像這樣讀取文件了...

Array = [myArrays objectAtIndex:arrayCounter]; //This tells it which Array to load.

myObject = [Array objectAtIndex:0]; //This reads that object in the array. (This is what I want to edit.)

我想知道如何編輯該對象（它是一個字符串），然后將其保存回數組，然后將該數組保存回存儲它的Plist文件中。

提前致謝！

PS-如果需要，我願意發布更多代碼或信息。

Answer 1

您不能將數據保存在應用程序的主捆綁包中，而必須在文檔目錄中進行如下操作：

 NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *plistFilePath = [documentsDirectory stringByAppendingPathComponent:@"Data.plist"];

if([[NSFileManager defaultManager] fileExistsAtPAth:plistFilePath]) 
{//plist already exits in doc dir so save content in it

 NSMutableArray *data = [NSMutableArray arrayWithContentsOfFile:plistFilePath];
 NSArray *arrValue = [data objectAtIndex:arrayCounter];

 NSString *strValue = [arrValue objectAtIndex:0];
 strValue = [strValue stringByAppending:@"hello"]; //change your value here

 [[data objectAtIndex:arrayCounter] replaceObjectAtIndex:0 withObject:strValue]; //value replaced
 [data writeToFile:plistFilePath atomically:YES];
}
else{ //firstly take content from plist and then write file document directory. it will be executed only once

 NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"Data" ofType:@"plist"];
 NSMutableArray *data = [NSMutableArray arrayWithContentsOfFile:plistPath];
 NSArray *arrValue = [data objectAtIndex:arrayCounter];

 NSString *strValue = [arrValue objectAtIndex:0];
 strValue = [strValue stringByAppending:@"hello"]; //change your value here

 [[data objectAtIndex:arrayCounter] replaceObjectAtIndex:0 withObject:strValue]; //value replaced
 [data writeToFile:plistFilePath atomically:YES];

}