Question

我已在互联网上检查方法，但那无法更新数据。

在pickerView：didSelectRow：inComponent方法中，我测试了cameraCode，我在pickerView中选择了不同的行后，数组的键已被更改，但是该值没有写入我的plist文件，名为MultiSetting.plist，即使我写下声明：

path = [[NSBundle mainBundle] pathForResource:@"MultiSetting" ofType:@"plist"];
[settingInfo writeToFile:path atomically:YES];

有没有可以帮助我提高技能？

这是我的代码：

MultiSettingViewController.h

#import <UIKit/UIKit.h>

@interface MultiSettingViewController : UIViewController

@property (nonatomic) NSInteger *camNum;

@property (nonatomic, retain) IBOutlet UIPickerView *picker;
@property (strong, nonatomic) IBOutlet UITextField *textField;
@property (nonatomic,retain) IBOutlet UISegmentedControl *segmentedControl;
@property (retain, nonatomic) IBOutlet UILabel *regionLabel;
@property (retain, nonatomic) IBOutlet UILabel *placeLabel;

@property (nonatomic, retain) NSArray *placeArray;
@property (strong, nonatomic) NSMutableArray *settingArray;
@property (strong, nonatomic) UIToolbar *doneToolbar;
@property (strong, nonatomic) NSBundle *bundle;
@property (strong, nonatomic) NSString *path;
@property (strong, nonatomic) NSBundle *bundle1;
@property (strong, nonatomic) NSString *path1;


- (IBAction)segmentedControlIndexChanged;
- (void)doneBtn_OnClick:(id)sender;
- (IBAction)textfield_OnClick:(id)sender;

@end

MultiSettingViewController.m

#import "MultiSettingViewController.h"

@implementation MultiSettingViewController

@synthesize camNum, picker, placeArray, settingArray, textField, doneToolbar, segmentedControl, bundle, path, bundle1, path1, regionLabel, placeLabel;

- (void)viewDidLoad{
    [super viewDidLoad];

    //NSLog(@"%i", camNum);

    bundle = [NSBundle mainBundle];
    path = [bundle pathForResource:@"HK" ofType:@"plist"];  placeArray = [[NSArray alloc] initWithContentsOfFile:path];

    bundle = [NSBundle mainBundle];
    path = [bundle pathForResource:@"MultiSetting" ofType:@"plist"];    settingArray = [[NSMutableArray alloc] initWithContentsOfFile:path];

    if (self.segmentedControl.selectedSegmentIndex == 0){
        NSInteger selectedRow = [self.picker selectedRowInComponent:0];

        NSDictionary *placeInfo = [placeArray objectAtIndex:selectedRow];
        [regionLabel setText:[placeInfo objectForKey:@"name"]];
    }

    if(self.doneToolbar == nil){
        self.doneToolbar = [[UIToolbar alloc] initWithFrame: CGRectMake(0, 0, 320, 40)];
        UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                                                                 target:self
                                                                                 action:@selector(doneBtn_OnClick:)];
        [self.doneToolbar setItems: [NSArray arrayWithObject:doneBtn]];
    }

    self.textField.inputView = self.picker;
    self.textField.inputAccessoryView = self.doneToolbar;
    self.textField.delegate = self;
    self.picker.delegate = self;
    self.picker.dataSource = self;
    self.picker.hidden = YES;


    self.doneToolbar.barStyle = UIBarStyleBlackTranslucent;
    self.doneToolbar.hidden = YES; }

-(IBAction) segmentedControlIndexChanged{
    switch (self.segmentedControl.selectedSegmentIndex){
        case 0:
            bundle = [NSBundle mainBundle];
            path = [bundle pathForResource:@"HK" ofType:@"plist"];
            placeArray = [[NSArray alloc] initWithContentsOfFile:path];
            [self.picker reloadAllComponents];

            NSInteger selectedRow = [self.picker selectedRowInComponent:0];
            NSDictionary *placeInfo = [placeArray objectAtIndex:selectedRow];
            [regionLabel setText:[placeInfo objectForKey:@"name"]];
            break;
        case 1:
            bundle = [NSBundle mainBundle];
            path = [bundle pathForResource:@"KW" ofType:@"plist"];
            placeArray = [[NSArray alloc] initWithContentsOfFile:path];
            [self.picker reloadAllComponents];

            selectedRow = [self.picker selectedRowInComponent:0];
            placeInfo = [placeArray objectAtIndex:selectedRow];
            [regionLabel setText:[placeInfo objectForKey:@"name"]];
            break;
        case 2:
            bundle = [NSBundle mainBundle];
            path = [bundle pathForResource:@"TW" ofType:@"plist"];
            placeArray = [[NSArray alloc] initWithContentsOfFile:path];
            [self.picker reloadAllComponents];

            selectedRow = [self.picker selectedRowInComponent:0];
            placeInfo = [placeArray objectAtIndex:selectedRow];
            [regionLabel setText:[placeInfo objectForKey:@"name"]];
            break;
        case 3:
            bundle = [NSBundle mainBundle];
            path = [bundle pathForResource:@"TM" ofType:@"plist"];
            placeArray = [[NSArray alloc] initWithContentsOfFile:path];
            [self.picker reloadAllComponents];

            selectedRow = [self.picker selectedRowInComponent:0];
            placeInfo = [placeArray objectAtIndex:selectedRow];
            [regionLabel setText:[placeInfo objectForKey:@"name"]];
            break;
        case 4:
            bundle = [NSBundle mainBundle];
            path = [bundle pathForResource:@"TP" ofType:@"plist"];
            placeArray = [[NSArray alloc] initWithContentsOfFile:path];
            [self.picker reloadAllComponents];

            selectedRow = [self.picker selectedRowInComponent:0];
            placeInfo = [placeArray objectAtIndex:selectedRow];
            [regionLabel setText:[placeInfo objectForKey:@"name"]];
            break;
        case 5:
            bundle = [NSBundle mainBundle];
            path = [bundle pathForResource:@"ST" ofType:@"plist"];
            placeArray = [[NSArray alloc] initWithContentsOfFile:path];
            [self.picker reloadAllComponents];

            selectedRow = [self.picker selectedRowInComponent:0];
            placeInfo = [placeArray objectAtIndex:selectedRow];
            [regionLabel setText:[placeInfo objectForKey:@"name"]];
            break;
        case 6:
            bundle = [NSBundle mainBundle];
            path = [bundle pathForResource:@"LT" ofType:@"plist"];
            placeArray = [[NSArray alloc] initWithContentsOfFile:path];
            [self.picker reloadAllComponents];

            selectedRow = [self.picker selectedRowInComponent:0];
            placeInfo = [placeArray objectAtIndex:selectedRow];
            [regionLabel setText:[placeInfo objectForKey:@"name"]];
            break;
        default:
            break;
    } }

#pragma mark -
#pragma mark UIPickerViewDataSource methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {    return 1; }

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {   return [placeArray count]; }

#pragma mark -
#pragma mark UIPickerViewDelegate methods
- (NSString *)pickerView:(UIPickerView *)pickerView
             titleForRow:(NSInteger)row             forComponent:(NSInteger)component {     NSDictionary *placeInfo = [placeArray objectAtIndex:row];   return [placeInfo objectForKey:@"name"]; }

- (void)pickerView:(UIPickerView *)pickerView     didSelectRow:(NSInteger)row
       inComponent:(NSInteger)component {   NSDictionary *placeInfo = [placeArray objectAtIndex:row];   NSString *name = [placeInfo objectForKey:@"name"];
    self.placeLabel.text = name;
    NSString *code = [placeInfo objectForKey:@"cameraCode"];

    NSMutableDictionary *settingInfo = [settingArray objectAtIndex:(NSInteger)camNum];
    NSLog(@"%@", [settingInfo objectForKey:@"cameraCode"]);
    [settingInfo setObject:code forKey:@"cameraCode"];
    NSLog(@"%@", [settingInfo objectForKey:@"cameraCode"]);
    path = [[NSBundle mainBundle] pathForResource:@"MultiSetting" ofType:@"plist"];
    [settingInfo writeToFile:path atomically:YES];

    //[self obtainPic:cameraCode];

    /*aTimer = [NSTimer scheduledTimerWithTimeInterval:60.0
     target:self
     selector:@selector(timerFired:)
     userInfo:nil
     repeats:YES];
     */ }

- (void)doneBtn_OnClick:(id)sender{
    [self.textField endEditing:YES];
    self.picker.hidden = YES;
    self.doneToolbar.hidden = YES; }

- (IBAction)textfield_OnClick:(id)sender{
    self.picker.hidden = NO;
    self.doneToolbar.hidden = NO; }

- (void)didReceiveMemoryWarning{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated. }

@end

非常感谢您真诚的帮助！

Answer 1

主要包中包含的所有内容都是只读;因此，您的日志中可能有一个Cocoa错误513（“操作无法完成。操作不允许”）。

您还有三个可读/写的数据存储文件夹：Temp，Cache和Documents

您可以在运行时在文档文件夹中创建文件MultiSetting.plist，然后写入。

您可以检索文档目录的路径，如下所示：

 NSArray * documentPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 NSString * documentDirectory = [documentPath objectAtIndex:0];

修改

然后，您可以在那里复制您的pList（请注意，如前所述，它是只读的，因此您将无法移动它或从包中删除它）。为此，请使用NSFileManagers的函数-copyItemAtPath：

- (BOOL)copyItemAtPath:(NSString *)srcPath toPath:(NSString *)dstPath error:(NSError **)error

Answer 2

您正在尝试写入位于应用程序包内的文件。这肯定不是写入用户设置的位置。 iOS也不会让你这么做，因为沙盒会阻止对应用程序包的应用程序写入权限。

使用适当的API获取可以实际编写的文件系统位置。 Documentation is here.

无法将数据写入plist文件

2 个答案:

修改