如何在iphone中使用'string'变量作为'objectForkey'

Question

我想将字符串用作objectForkey。我的代码行是这个。

我想将“strend”用作objectForkey，但它不起作用。

代码是：

NSString *strend = [[NSString alloc] initWithFormat:@"%@",[[detwec.arrdetails objectAtIndex:0]valueForKey:@"EndDate"]];

NSString *dateString = [[NSString alloc]initWithFormat:@"%@",[_currentItemValue objectForKey:@"strend" ]];

Answer 1

尝试替换此行

NSString *dateString = [[NSString alloc]initWithFormat:@"%@",[_currentItemValue objectForKey:@"strend" ]];

由此

NSString *dateString = [[NSString alloc]initWithFormat:@"%@",[_currentItemValue objectForKey:strend]];

Answer 2

如果你想使用字符串作为键读取值，你可以使用：

NSString *value = ["Your Dictionary" objectForKey:strend];

检查你的NSString * strend不应该是“nil”否则不会给你任何价值。

Answer 3

你可以尝试

NSString *strend = [NSString stringWithFormat:@"%@",[detwec.arrdetails objectAtIndex:0]valueForKey:@"EndDate"];

NSString *dateString = [NSString stringWithFormat:@"%@",[_currentItemValue objectForKey:@"strend" ]];

或者

NSString *dateString = [_currentItemValue objectForKey:@"strend" ];

Answer 4

NSString * strend = [NSString stringWithFormat：@“％@”，[detwec.arrdetails objectAtIndex：0]]; NSUserDefaults * storeData = [NSUserDefaults standardUserDefaults];
[storeData setObject：strend forKey：@“strend”];
 NSString * dateString = [storeData objectForKey：@“strend”];