iOS 之plist的使用

      在iOS的开发中,用到plist的时候还是很多的,那到底怎么用呢?接下来我们进行介绍......

plist的创建:

图1

创建完plist,你可以选择plist的数据是字典还是数组

图2

2.plist的存取删:

存:

NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"Data" ofType:@"plist"];

NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

NSString *plistPath1 = [paths objectAtIndex:0];

//得到完整的文件名

NSString *filename=[plistPath1 stringByAppendingPathComponent:@"Data.plist"];

NSMutableArray * data_arr = [[NSMutableArray alloc]initWithContentsOfFile:filename];

if (!data_arr) {

data_arr = [[NSMutableArray alloc]initWithContentsOfFile:plistPath];

}else{

data_arr = [[NSMutableArray alloc]initWithContentsOfFile:filename];

}

NSLog(@"----dataArr--%@",data_arr);

NSMutableDictionary * dic = [[NSMutableDictionary alloc]init];

[dic setObject:time forKey:@"time"];

[dic setObject:sort forKey:@"sort"];

[dic setObject:price forKey:@"price"];

[data_arr addObject:dic];

//输入写入

[data_arr writeToFile:filename atomically:YES];

NSMutableArray *data1 = [[NSMutableArray alloc] initWithContentsOfFile:filename];

NSLog(@"data==%@",data1);

注意:在存数据的时候一定要先判断你拿到的data_arr对象到底存在不存在

取:

NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

NSString *plistPath1 = [paths objectAtIndex:0];

//得到完整的文件名

NSString *filename=[plistPath1 stringByAppendingPathComponent:@"Data.plist"];

dataSource = [[NSMutableArray alloc] initWithContentsOfFile:filename];

删:

删除某一个元素:

NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

NSString *plistPath1 = [paths objectAtIndex:0];

//得到完整的文件名

NSString *filename=[plistPath1 stringByAppendingPathComponent:@"caogao.plist"];

NSMutableArray * data_arr = [[NSMutableArray alloc]initWithContentsOfFile:filename];

[data_arr removeObjectAtIndex:self.index];

//输入写入

[data_arr writeToFile:filename atomically:YES];

NSMutableArray *data1 = [[NSMutableArray alloc] initWithContentsOfFile:filename];

NSLog(@"删除草稿后数据data==%@",data1);

删除所有的元素:

NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

NSString *plistPath1 = [paths objectAtIndex:0];

//得到完整的文件名

NSString *filename=[plistPath1 stringByAppendingPathComponent:@"caogao.plist"];

NSMutableArray * data_arr = [[NSMutableArray alloc]initWithContentsOfFile:filename];

[data_arr removeAllObjects];

//输入写入

[data_arr writeToFile:filename atomically:YES];

NSMutableArray *data1 = [[NSMutableArray alloc] initWithContentsOfFile:filename];

NSLog(@"删除草稿后数据data==%@",data1);