在iOS 11上出现scrollview布局往下偏移问题

在ios 11上出现scrollview布局往下偏移问题

//
//  viewcontroller.m
//

#import "viewcontroller.h"
@interface viewcontroller ()
@property (nonatomic,strong)uiscrollview * scrollview;
@end

@implementation viewcontroller

- (uiscrollview *)scrollview {
    if (!_scrollview) {
        _scrollview = [[uiscrollview alloc] init];
        _scrollview.frame = cgrectmake(0, 0, 300, 300);
    }
    return _scrollview;
}

- (void)viewdidload {
    self.scrollview.backgroundcolor = [uicolor graycolor];
    [self.view addsubview:self.scrollview];
    //??=============判断系统版本
    if (@available(ios 11.0, *)) {
        self.scrollview.contentinsetadjustmentbehavior = uiscrollviewcontentinsetadjustmentnever;
        nslog(@"11.0f");
        } else {
            self.automaticallyadjustsscrollviewinsets = no;
            nslog(@"10f");
        }
}

@end