-(NSArray *)charactersFromChapter:(NSInteger)number {
    NSObject *noError = [[NSObject alloc] init];
    //line above does not cause error
    NSArray *characters;
    switch (number) {
        case 1:
            NSObject *obj = [[NSObject alloc] init];
            //error happens in line above (Expected expression)
            characters = [NSArray arrayWithObject:obj];
            break;
        case 2:

            break;
        case 3:

            break;
    }
    return characters;
}

解决方法

switch (some_expression) {
   case case_1:
   { // notice the brackets
       id some_obj = [MyObj new];
       break;
   }
   default:
       break; 
}

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