以编程方式将字典添加到 Plist

Question

我正在尝试以以下格式以编程方式将字典添加到 plist：

根（字典） | StringOfViewID(字典) | 按钮标题（字典） | 细绳 字符串

我可以成功地做到这一点，但我想在同一个 ViewID(Dict) 下继续向 ViewID(Dict) 添加更多 ButtonTitle(Dict)。

目前我只能替换现有的。

类似这样的：

根（字典） | StringOfViewID(Dict) - ButtonTitle(Dict)(2)-String String | ButtonTitle(字典)(1) | 细绳 字符串

这是我正在使用的代码：

//Initialize and load the plist file here: 
[...]
            NSMutableDictionary *data;
            NSMutableDictionary *viewID;
            NSMutableDictionary *buttonName;
            NSArray *keys;
            NSArray *locations;


        // Insert the data into the plist

        NSNumber *xNumber = [[NSNumber alloc] initWithDouble:locationX];
        NSNumber *yNumber = [[NSNumber alloc] initWithDouble:locationY];

        keys = [NSArray arrayWithObjects:@"locationX", @"locationY", nil];
        locations = [NSArray arrayWithObjects:xNumber, yNumber, nil];
        data = [NSMutableDictionary dictionaryWithObjects:locations forKeys:keys];
        buttonName = [NSMutableDictionary dictionaryWithObject:data forKey:myButtonTitle];
        viewID = [NSMutableDictionary dictionaryWithObject:buttonName forKey:@"StringOfViewID"];

        [viewID writeToFile:path atomically:YES];

谢谢

Answer 1

只需先将文件加载到 NSMutableDictionary 中，对其进行更改，然后使用您已经使用的相同代码将其写回文件。

编辑：关于用于编辑列表的结构，您可以拥有一组按钮字典

   NSMutableDictionary* oldDictionary=[NSMutableDictionary dictionaryWithContentsOfFile:path];

   // make the new button dictionary
   NSNumber *xNumber = [[NSNumber alloc] initWithDouble:locationX];
   NSNumber *yNumber = [[NSNumber alloc] initWithDouble:locationY];

   NSDictionary*buttonDictionary=@{@"locationX": xNumber,
                                   @"locationY":yNumber,
                                   @"myButtonTitle":myButtonTitle};
   NSMutableArray *buttonsArray = [oldDictionary objectForKey:@"StringOfViewID"];
   //append it to the array
   [buttonsArray addObject:buttonDictionary];
   //replace the old array with the new one
   [oldDictionary setObject:buttonsArray forKey:@"StringOfViewID"];
   //write it back to the file
   [oldDictionary writeToFile:path atomically:YES];

或按钮字典的字典

    NSMutableDictionary* oldDictionary=[NSMutableDictionary dictionaryWithContentsOfFile:path];

    // make the new button dictionary
    NSNumber *xNumber = [[NSNumber alloc] initWithDouble:locationX];
    NSNumber *yNumber = [[NSNumber alloc] initWithDouble:locationY];

    NSDictionary*buttonLocationDictionary=@{@"locationX": xNumber, @"locationY":yNumber};
    NSMutableDictionary *buttonsDictionary = [oldDictionary objectForKey:@"StringOfViewID"];
    //add it to the dictionary
    [buttonsDictionary  setObject:buttonLocationDictionary forKey:myButtonTitle];//be sure that this is a new button title,or else it will replace the old value with this title.

    //replace the old dictionary with the new one
    [oldDictionary setObject:buttonsDictionary forKey:@"StringOfViewID"];
    //write it back to the file
    [oldDictionary writeToFile:path atomically:YES];

我尝试不更改您正在使用的结构或键，并且我假设StringOfViewID 是当前感兴趣视图中的所有按钮都具有的键，而其他视图将具有其他键。

Answer 2

我会创建一个类作为数据模型。这是一个简单的实现——创建Button 对象可能比传递多个参数并检索字典更简洁

ViewButtons.h

@interface ViewButtons : NSObject

+(ViewButtons *) viewButtonsWithContentsOfFile:(NSString *)file;

-(void) addButton:(NSString *)buttonName withX:(double) x andY:(double) y toView:(NSString *)viewName;
-(NSArray *)viewNames;
-(NSArray *)buttonNamesForView:(NSString *)viewName;
-(NSDictionary *)buttonWithName:(NSString *)name inView:(NSString *)viewName;
-(void)writeToFile:(NSString *)file;

@end

ViewButtons.m

#import "ViewButtons.h"

@interface ViewButtons ()

@property (nonatomic,strong) NSMutableDictionary *viewButtons;

@end

@implementation ViewButtons

-(id) init {
    if (self=[super init]) {
        self.viewButtons=[NSMutableDictionary new];
    }
    return self;
}

+(ViewButtons *) viewButtonsWithContentsOfFile:(NSString *)file {
    ViewButtons *newViewButtons=[ViewButtons alloc];
    newViewButtons.viewButtons=[NSMutableDictionary dictionaryWithContentsOfFile:file];
    return newViewButtons;
}

-(void) addButton:(NSString *)buttonName withX:(double) x andY:(double) y toView:(NSString *)viewName {
    NSMutableDictionary *viewDict=self.viewButtons[viewName];
    if (viewDict == nil) {
        viewDict=[NSMutableDictionary new];
        self.viewButtons[viewName]=viewDict;
    } else if (![viewDict isKindOfClass:[NSMutableDictionary class]]) {
        viewDict=[viewDict mutableCopy];
        self.viewButtons[viewName]=viewDict;
    }
    NSNumber *xNumber = [NSNumber numberWithDouble:x];
    NSNumber *yNumber = [NSNumber numberWithDouble:y];
    NSDictionary *buttonDict=@{@"locationX":xNumber,@"locationY":yNumber};
    viewDict[buttonName]=buttonDict;
}


-(NSArray *)viewNames {
    return self.viewButtons.allKeys;
}

-(NSArray *)buttonNamesForView:(NSString *)viewName {
    return [self.viewButtons[viewName] allKeys];
}
-(NSDictionary *)buttonWithName:(NSString *)name inView:(NSString *)viewName {
    return self.viewButtons[viewName][name];
}

-(void)writeToFile:(NSString *)file {
    [self.viewButtons writeToFile:file atomically:YES];
}

@end

你可以像下面这样使用这个类-

ViewButtons *viewButtons=[ViewButtons viewButtonsWithContentsOfFile:buttonFile];
if (viewButtons == nil) {
    viewButtons=[ViewButtons new];
}

[viewButtons addButton:@"MyButton1" withX:0 andY:0 toView:@"MyView"];
[viewButtons addButton:@"MyButton2" withX:1 andY:1 toView:@"MyView"];
[viewButtons addButton:@"MyButton3" withX:0 andY:0 toView:@"MySecondView"];
[viewButtons addButton:@"MyButton4" withX:0 andY:1 toView:@"MyThirdView"];
[viewButtons writeToFile:buttonFile];