iOS 给字典中插入nil的几种情景
NSString *str = nil; NSDictionary *dic = @{@"key":str}; //zs20171220 会崩溃'*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[0] 字面量添加nil 会崩溃 NSString *str = nil; NSDictionary *dicParam = [[NSDictionary alloc] initWithObjectsAndKeys:@"",@"key1",str,@"key2",nil]; NSLog(@"dicParam____%@",dicParam[@"key2"]);//zs20171220 value 值可以为nil,但是这个时候nil意味着结束添加了 NSLog(@"dicParam____%@",dicParam.allKeys); NSLog(@"dicParam____%@",dicParam[@"key1"]);//zs20171...