SaveStudentMessagePlist.h 文件裏創建壹個初始化的函數
#import <Foundation/Foundation.h>
@interface SaveStudentMessagePlist : NSObject
-(id)initWithStudentName:(NSString *)name Studentage:(NSString *)age StudentNumber:(NSString * )numerb StudentNation:(NSString *)nation;
@end
//////////////////////////////////////////在.m文件裏實現方法///////////////////////////////////////////////////////////////////
-(id)initWithStudentName:(NSString *)name Studentage:(NSString *)age StudentNumber:(NSString * )numerb StudentNation:(NSString *)nation
{
//我們把學生的信息保存在可變數組裏
NSMutableArray *studentMessageArray = [[NSMutableArray alloc]initWithObjects:name,age,numerb,nation,nil];
if (self = [superinit])
{
[self createStudentMessagePlist:studentMessageArraykey:numerb]; // 因為學生的學號是唯壹的作為詞典的key值
}
return self;
}
// 創建plist 寫入操作
-(void)createStudentMessagePlist:(NSMutableArray *)studentMessageArray key:(NSString *)studentNumebr
{
//沙盒路徑
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
// plist 路徑
NSString *plistPath = [documentsDirectorystringByAppendingPathComponent:@"student.plist"];
NSFileManager *fileManager = [[NSFileManager alloc]init];
// 下面這幾步很重要 通過文件管理器 來判讀plist 文件是否存在！ 如果不存在 我們就通過 [fileManager createFileAtPath:plistPath contents:nil attributes:nil創建壹個plist 並檢測是否成功失敗！存在後寫入詞典
如何存在plist 我們就 在 studentMessageDic 可變詞典裏保存在來色數據這樣可以避免數據被覆蓋問題
if(![fileManager fileExistsAtPath:plistPath])
{
if(![fileManager createFileAtPath:plistPathcontents:nilattributes:nil])
{
NSLog(@"create file error");
}
else
{
NSDictionary* studentMessageDic = [NSDictionary dictionaryWithObjectsAndKeys:studentMessageArray,studentNumebr ,nil];
[studentMessageDic writeToFile:plistPathatomically:YES];
}
}
else
{
NSMutableDictionary *studentMessageDic = [[NSMutableDictionary alloc]initWithContentsOfFile: plistPath];
[studentMessageDic setObject: studentMessageArray forKey:studentNumebr ];
[studentMessageDic writeToFile:plistPathatomically:YES];
}
}
現在讓我們調用方法吧！ 打印路徑plistPath 我們在沙盒裏就會找到妳的文件了如下圖
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if (![studentNumberTextField.tex tisEqualToString:@"" ])
{
SaveStudentMessagePlist *save = [[SaveStudentMessagePlist alloc]initWithStudentName:studentNameTextField.textStudentage:studentAgeTextFIeld.textStudentNumber:studentNumberTextField.textStudentNation:studentnationTextField.text];
}
}
三 對plist 經行讀操作
我創建了壹個只定義的tableview 來顯示學生的信息
-(void)readStudentMessageFromPlist
{
//創建文件管理器
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *documentation = [path objectAtIndex:0];
//更改到待操作的目錄下
[fileManager changeCurrentDirectoryPath:[documentationstringByExpandingTildeInPath]];
NSString *studentPlistPath = [documentation stringByAppendingPathComponent:@"student.plist"];
_studentMessageDic = [[NSMutableDictionary alloc]initWithContentsOfFile:studentPlistPath];
NSLog(@"%d", [_studentMessageDicallKeys].count);
}
然後在tableview上顯示
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [[_studentMessageDicallKeys]count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *keyValue = [[_studentMessageDic allKeys]objectAtIndex:indexPath.row];
NSArray *studenMessageArr = [_studentMessageDic objectForKey:keyValue];
static NSString *CellIdentifier =@"Cell";
StudentCell *cell = (StudentCell *)[tableView dequeueReusableCellWithIdentifier:@"StudentCell"];
if (cell == nil)
{
if (cell == nil)
{
cell = [[StudentCellalloc]initWithStyle: UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
}
cell.name.text = [studenMessageArrobjectAtIndex:0];
cell.age.text = [studenMessageArrobjectAtIndex:1];
cell.number.text = [studenMessageArrobjectAtIndex:2];
cell.national.text = [studenMessageArrobjectAtIndex:3];
return cell;
}