iPhone Dev-从Plist编辑数组中的对象

Question

我有一个Plist，其中有多个Array。 在这些数组中，我正在读取不同的对象，但是在编辑数组中的这些对象然后将数组再次保存回Plist文件时，我陷入了困境。

我已经像这样读取文件了...

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.)

我想知道如何编辑该对象（它是一个字符串），然后将其保存回数组，然后将该数组保存回存储它的Plist文件中。

提前致谢！

PS-如果需要，我愿意发布更多代码或信息。

Answer 1

您不能将数据保存在应用程序的主捆绑包中，而必须在文档目录中进行如下操作：

 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];

}