我正在开发一个应用程序。我尝试使用以下代码为 NSDictionary 的特定键设置值,
NSMutableArray *testArray=[NSMutableArray arrayWithObjects“Jan Month",@“Feb Month",@“Mar Month",@“Apr Month",@“May Month",@“June Month",@“July Month",@“Aug Month",@“Sep Month",@“Oct Month", nil];
NSMutableArray *testResult=[NSMutableArray arrayWithObjects"ass",@"ass",@"ass",@"ass",@"ass",@"ass",@"ass",@"ass",@"ass",@"ass", nil];
NSDictionary *testDetails=[NSDictionary dictionaryWithObjects:testArray forKeys:testResult];
[testDetails setValue"Fail" forKey“Feb Month"];
我的应用程序在第四行崩溃并给出错误,
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<__NSDictionaryI 0x1741a2f40> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key Feb Month.'
我尝试通过检查来解决这个问题,
po [self.testDetails valueForKey:"Feb Month"]
<extracting data from value failed>
请帮我解决这个问题。
您需要为对象设置testResult
,为键设置testArray
。现在如果你想改变它的值你需要将它声明为NSMutableDictionary
。
NSMutableDictionary *testDetails = [NSMutableDictionary dictionaryWithObjects:testResult forKeys:testArray];
[testDetails setValue"Fail" forKey“Feb Month"];
关于ios - setvalue :forkey: not working, 应用程序崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41978813/
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