最近感觉好多人还在问如何判断iOS11系统的问题，以为过了这么多大家都适配好了，其实不然。
为什么要搞一个宏定义呢，因为有些小伙伴Xcode版本还是停留在Xcode8，这样判断是iOS11的方法就尴尬了，所以搞个宏。

//-----------------------------------  iOS11适配  ------------------------------------
#define  adjustsScrollViewInsets(scrollView)\
do {\
    _Pragma("clang diagnostic push")\
    _Pragma("clang diagnostic ignored \"-Warc-performSelector-leaks\"")\
    if ([scrollView respondsToSelector:NSSelectorFromString(@"setContentInsetAdjustmentBehavior:")]) {\
        NSMethodSignature *signature = [UIScrollView instanceMethodSignatureForSelector:@selector(setContentInsetAdjustmentBehavior:)];\
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];\
        NSInteger argument = 2;\
        invocation.target = scrollView;\
        invocation.selector = @selector(setContentInsetAdjustmentBehavior:);\
        [invocation setArgument:&argument atIndex:2];\
        [invocation retainArguments];\
        [invocation invoke];\
    }\
    _Pragma("clang diagnostic pop")\
} while (0)

在需要使用的地方写上：

adjustsScrollViewInsets(<#scrollView#>)

即可。