我想检查一个NSDictionary
是否为空。我正在这样做。检查NSDictionary是否为空
mutDictValues = [[[NSUserDefaults standardUserDefaults] objectForKey:@"dicValues"]mutableCopy];
NSLog(@"dictValues are %@",mutDictValues);
if(mutDictValues == NULL){
arrCities = [[NSMutableArray alloc]init];
NSLog(@"no cities seleceted");
}else{
arrCities = [[NSMutableArray alloc]init];
arrCities = [mutDictValues objectForKey:@"cities"];
[self placeCities];
}
但它在这一行arrCities = [mutDictValues objectForKey:@"cities"];
,出现以下错误alwasy崩溃:
-[__NSCFConstantString objectForKey:]:
有人可以帮助我?
如果([dictTemp isKindOfClass:[NSDictionary的类]!){// 做一些 DisplayAlert(@ “没有找到数据”) } – kb920