ios学习笔记——属性列表

一、介绍

属性列表文件是一种XML文件，Foundation框架中的数组和字典等都可以与属性列表文件互相转换。

通过直接操作属性列表，可以实现数据持久化。

二、数组和字典读写

NSArray读写属性列表的方法：

+ (NSArray<ObjectType> *)arrayWithContentsOfFile:(NSString *)aPath

类级构造方法，用于从属性列表中读取数据，创建NSArray对象

- (NSArray<ObjectType> *)initWithContentsOfFile:(NSString *)aPath

实例构造方法，用于从属性列表中读取数据，创建NSArray对象。

- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)flag

改方法把NSArray对象写入属性列表中，他的第一个参数是文件名，第二个参数是否使用辅助文件，如果为YES先写入到一个辅助文件中，然后辅助文件再重新命名为目录文件，如果为NO，则直接写入到目标文件。

NSDictionary读写属性列表的方法与NSArray的方法基本类似，如下：

+ (NSDictionary<KeyType,ObjectType> *)dictionaryWithContentsOfFile:(NSString *)path

- (NSDictionary<KeyType,ObjectType> *)initWithContentsOfFile:(NSString *)path

- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)flag

三、例子

fileOperate.m文件操作类

 1 #import "fileOperate.h"
 2 
 3 @implementation fileOperate
 4 
 5 //获取沙盒路径
 6 - (NSString *)getDocumentPath
 7 {
 8     NSString * pathArr = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
 9     NSString * strPath = [pathArr stringByAppendingPathComponent:@"sjz.plist"];
10     return strPath;
11 }
12 
13 //将新加入的数据保存在文件中
14 - (void)addNotepad:(NSMutableDictionary *)dict
15 {
16     NSString * strPath = [self getDocumentPath];
17     //读取文件保存在数组中
18     NSMutableArray * arr = [NSMutableArray arrayWithContentsOfFile:strPath];
19     if(!arr){
20         arr = [[NSMutableArray alloc] init];
21     }
22     
23     //将数据加入到数组中
24     [arr addObject:dict];
25     //将数组写的问价中
26     [arr writeToFile:strPath atomically:YES];
27 }
28 
29 - (void)removeNotepad:(NSMutableDictionary *)dict
30 {
31     NSString * strPath = [self getDocumentPath];
32     NSMutableArray * array = [NSMutableArray arrayWithContentsOfFile:strPath];
33 
34     for(NSMutableDictionary * dictionary in array){
35         if([[dictionary objectForKey:@"date"] isEqualToString:[dict objectForKey:@"date"]]){
36             //删除数据
37             [array removeObject:dict];
38             [array writeToFile:strPath atomically:YES];
39             break;
40         }
41     }
42 }
43 
44 - (NSMutableArray *)listArr
45 {
46     NSString * strPath = [self getDocumentPath];
47     NSMutableArray * arr = [NSMutableArray arrayWithContentsOfFile:strPath];
48     
49     return arr;
50 }
51 
52 @end

JZViewController.m

  1 #import "JZViewController.h"
  2 #import "fileOperate.h"
  3 #import "JZAddViewController.h"
  4 
  5 @interface JZViewController ()<UITableViewDataSource, UITableViewDelegate, JZAddViewController>
  6 
  7 @property (nonatomic, strong) UITableView * tableView;
  8 @property (nonatomic, strong) fileOperate * operate;
  9 @property (nonatomic, strong) NSMutableArray * listArr;
 10 
 11 @end
 12 
 13 @implementation JZViewController
 14 
 15 - (void)viewDidLoad {
 16     [super viewDidLoad];
 17     self.title = @"记事本";
 18     
 19     self.operate = [[fileOperate alloc] init];
 20     self.listArr = [self.operate listArr];
 21     
 22     [self initTableView];
 23     [self createNavButton];
 24 }
 25 
 26 - (void)createNavButton
 27 {
 28 //    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Edit" style:UIBarButtonItemStyleDone target:self action:@selector(editNotepad)];
 29     /**
 30      *将左键设置成编辑按钮，这个是视图控制器已经存在的，它可以获取编辑按钮的对象指针
 31      *编辑按钮的样式可以咋Edit和Done之间转换，如果切换取决于当前的视图是否处于编辑状态。
 32      *点击时，会调用会调用setEditing:animated:方法
 33      */
 34     self.navigationItem.leftBarButtonItem = self.editButtonItem;
 35     if(self.listArr.count <= 0){
 36         self.editButtonItem.enabled = NO;
 37     }
 38     
 39     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Add" style:UIBarButtonItemStyleDone target:self action:@selector(addNotepad)];
 40 }
 41 
 42 - (void)initTableView
 43 {
 44     UITableView * tableView = [[UITableView alloc] initWithFrame:self.view.bounds];
 45     tableView.backgroundColor = [UIColor whiteColor];
 46     tableView.delegate = self;
 47     tableView.dataSource = self;
 48     tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
 49     [self.view addSubview:tableView];
 50     
 51     self.tableView = tableView;
 52 }
 53 
 54 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 55 {
 56     return 1;
 57 }
 58 
 59 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 60 {
 61     return self.listArr.count;
 62 }
 63 
 64 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 65 {
 66     static NSString * strID = @"JZViewController";
 67     UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:strID];
 68     if(!cell){
 69         cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:strID];
 70     }else{
 71         for(UIView * view in [cell.contentView subviews]){
 72             [view removeFromSuperview];
 73         }
 74     }
 75     
 76     NSMutableDictionary * dict = [self.listArr objectAtIndex:indexPath.row];
 77     
 78     UILabel * label1 = [[UILabel alloc] initWithFrame:CGRectMake(15, 5, [UIScreen mainScreen].bounds.size.width - 30, 40)];
 79     label1.text = [dict objectForKey:@"text"];
 80     label1.font = [UIFont systemFontOfSize:17];
 81     label1.textAlignment = NSTextAlignmentLeft;
 82     label1.textColor = [UIColor blackColor];
 83     [cell.contentView addSubview:label1];
 84     
 85     UILabel * label2 = [[UILabel alloc] initWithFrame:CGRectMake(15, 45, [UIScreen mainScreen].bounds.size.width - 30, 20)];
 86     label2.text = [dict objectForKey:@"date"];
 87     label2.font = [UIFont systemFontOfSize:15];
 88     label2.textAlignment = NSTextAlignmentLeft;
 89     label2.textColor = [UIColor blackColor];
 90     [cell.contentView addSubview:label2];
 91     
 92     UIView * view = [[UIView alloc] initWithFrame:CGRectMake(0, 79.5, [UIScreen mainScreen].bounds.size.width, 0.5)];
 93     view.backgroundColor = [UIColor grayColor];
 94     [cell.contentView addSubview:view];
 95     return cell;
 96 }
 97 
 98 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
 99 {
100     return 80;
101 }
102 
103 //在编辑状态下，设置单元格是增加还是删除
104 - (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
105 {
106     return UITableViewCellEditingStyleDelete;
107 }
108 
109 - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
110 {
111     //删除完毕后，将左边按钮，设置为Edit
112     [self setEditing:NO];
113     
114     NSMutableDictionary * dict = [self.listArr objectAtIndex:indexPath.row];
115     [self.operate removeNotepad:dict];
116     //删除数据，数据来源于哪里，就删除哪里的数据
117     [self.listArr removeObjectAtIndex:indexPath.row];
118     //删除cell的方法
119     [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
120     [self.tableView reloadData];
121     
122     if(self.listArr.count <= 0){
123         self.editButtonItem.enabled = NO;
124     }
125 }
126 
127 //是否显示高亮状态
128 - (BOOL)tableView:(UITableView *)tableView shouldHighlightRowAtIndexPath:(NSIndexPath *)indexPath
129 {
130     return NO;
131 }
132 
133 //跳转到JZAddViewController
134 - (void)addNotepad
135 {
136     JZAddViewController * add = [[JZAddViewController alloc] init];
137     add.delegate = self;
138     [self.navigationController pushViewController:add animated:YES];
139 }
140 
141 //JZAddViewController代理方法，增加数据后，刷新列表
142 - (void)loadViewData
143 {
144     self.listArr = [self.operate listArr];
145     [self.tableView reloadData];
146     if(self.listArr.count > 0){
147         self.editButtonItem.enabled = YES;
148     }
149 }
150 
151 //该方法是UIViewController的生命周期方法，用于响应视图编辑状态的变化，也就是editing参数
152 - (void)setEditing:(BOOL)editing animated:(BOOL)animated
153 {
154     [super setEditing:editing animated:animated];
155     
156     [self.tableView setEditing:editing animated:animated];
157 }
158 
159 @end

JZAddViewController是增加数据类

 1 #import <UIKit/UIKit.h>
 2 
 3 @protocol JZAddViewController <NSObject>
 4 
 5 - (void)loadViewData;
 6 
 7 @end
 8 
 9 @interface JZAddViewController : UIViewController
10 
11 @property (nonatomic, strong) id<JZAddViewController> delegate;
12 
13 @end
 1 #import "JZAddViewController.h"
 2 #import "fileOperate.h"
 3 
 4 @interface JZAddViewController () <UITextViewDelegate>
 5 
 6 @property (nonatomic, strong) UITextView * textView;
 7 @property (nonatomic, strong) UIButton * button;
 8 
 9 @end
10 
11 @implementation JZAddViewController
12 
13 - (void)viewDidLoad {
14     [super viewDidLoad];
15     self.view.backgroundColor = [UIColor whiteColor];
16     self.title = @"添加";
17     self.automaticallyAdjustsScrollViewInsets = NO;
18     
19     //添加手势，让textView放弃第一响应者
20     UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture)];
21     [self.view addGestureRecognizer:tap];
22     
23     [self initTextView];
24     [self initButton];
25 }
26 
27 - (void)initTextView
28 {
29     UITextView * textView = [[UITextView alloc] initWithFrame:CGRectMake(15, 74, [UIScreen mainScreen].bounds.size.width - 30, 150)];
30     //画边框，圆角
31     textView.layer.borderColor = [UIColor grayColor].CGColor;
32     textView.layer.borderWidth = 0.5;
33     textView.layer.cornerRadius = 5.0;
34     
35     textView.font = [UIFont systemFontOfSize:14];
36     textView.textColor = [UIColor grayColor];
37     
38     [self.view addSubview:textView];
39     
40     self.textView = textView;
41 }
42 
43 - (void)initButton
44 {
45     UIButton * button = [[UIButton alloc] initWithFrame:CGRectMake(20, 150 + 74 + 10, [UIScreen mainScreen].bounds.size.width - 40, 40)];
46     button.layer.borderColor = [UIColor grayColor].CGColor;
47     button.layer.borderWidth = 0.5;
48     button.layer.cornerRadius = 5.0;
49     
50     [button setTitle:@"确定" forState:UIControlStateNormal];
51     [button setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
52     [button addTarget:self action:@selector(addNotes) forControlEvents:UIControlEventTouchUpInside];
53     
54     [self.view addSubview:button];
55     
56     self.button = button;
57 }
58 
59 //添加nodes
60 - (void)addNotes
61 {
62     NSMutableDictionary * dict = [[NSMutableDictionary alloc] init];
63     [dict setObject:self.textView.text forKey:@"text"];
64     
65     NSDate * date = [NSDate date];
66     NSDateFormatter * formatter = [[NSDateFormatter alloc] init];
67     [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
68     NSString * str = [formatter stringFromDate:date];
69     [dict setObject:str forKey:@"date"];
70     
71     fileOperate * operater = [[fileOperate alloc] init];
72     [operater addNotepad:dict];
73     
74     [self.navigationController popViewControllerAnimated:YES];
75     
76     if([self.delegate performSelector:@selector(loadViewData)]){
77         [self.delegate loadViewData];
78     }
79 }
80 
81 //手势响应函数
82 - (void)tapGesture
83 {
84     [self.textView resignFirstResponder];
85 }
86 
87 @end
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原文地址：https://www.cnblogs.com/sjzlovecj/p/4837351.html