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Whatup。我试图在这里使用NSMutableDictionary
,方法checkNull
用一些默认值初始化字典(如果未设置)。但是,iOS模拟器在for
-loop中遇到的第一次崩溃。动态初始化NSDisctionsary
错误消息:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber mutableCopyWithZone:]: unrecognized selector sent to instance
代码:
+ (void)checkNull {
if ([[self defaults] valueForKey:@"channels"] == nil) {
NSNumber *defaultValue = [NSNumber numberWithBool:YES];
NSMutableDictionary *channels = [[NSMutableDictionary alloc] init];
for (NSString *channel in [self channelsList]) {
[channels setObject:[defaultValue mutableCopy] forKey:channel];
}
[[self defaults] setValue:channels forKey:@"channels"];
}
}
[self defaults]
返回[NSUserDefaults standardDefaults]
,而 [self channelsList]
返回一个NSArray
与约10 NSString
对象。
我哪里错了? 在此先感谢
这样做。我想我误解了'mutableCopy'的想法。谢谢。 –