我在iOS 11中发现了一个UINavigationBar错误.使用self.navigationItem.rightBarButtonItems = @ [fixSpaceItem,item]在viewDidLoad中快速设置导航项按钮.然后使用手势回弹,但我没有回弹,当弹出回来时,我松开手指并让视图控制器取消弹回,然后右侧导航按钮项目消失.左项按钮具有相同的问题.要重现此错误,您必须添加fixSpaceItem,如[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedspace target:nil action:nil].而真正的设备,但不是模拟器可以重现错误.
这是我的主要代码:
这是我的主要代码:
- (void)viewDidLoad { [super viewDidLoad]; self.navigationController.interactivePopGestureRecognizer.enabled = YES; self.navigationController.interactivePopGestureRecognizer.delegate = self; self.navigationItem.rightBarButtonItems = @[[self negativeSpacerWithWidth:5],[self rightButton]]; self.navigationItem.leftBarButtonItems = @[[self negativeSpacerWithWidth:5],[self leftButton]]; } - (UIBarButtonItem *)leftButton { UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0,35,35)]; [button setimage:[UIImage imageNamed:@"icon_app_back_normal"] forState:UIControlStatenormal]; [button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside]; UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithCustomView:button]; return item; } - (UIBarButtonItem *)rightButton { UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0,35)]; [button setimage:[UIImage imageNamed:@"setting"] forState:UIControlStatenormal]; UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithCustomView:button]; return item; } - (UIBarButtonItem *)negativeSpacerWithWidth:(CGFloat)width { UIBarButtonItem *spacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedspace target:nil action:nil]; [spacer setWidth:width]; return spacer; }
解决方法
将Fixedspace BarButtonItem添加到BarButtonItem数组时,这似乎是一个错误.如果要将偏移设置为导航项,可能必须使用其他方式,例如更改按钮的imageEdgeInsets.
- (void)viewDidLoad { [super viewDidLoad]; // Do not set Fixed Space type button item. self.navigationItem.leftBarButtonItem = [self leftButton]; self.navigationItem.rightBarButtonItem = [self rightButton]; // It work too //self.navigationItem.leftBarButtonItems = @[[self leftButton],[self leftButton]]; //self.navigationItem.rightBarButtonItems = @[[self rightButton],[self rightButton]]; self.navigationController.interactivePopGestureRecognizer.enabled = YES; self.navigationController.interactivePopGestureRecognizer.delegate = self; } - (UIBarButtonItem *)leftButton { UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0,35)]; //... // to add offset you want button.imageEdgeInsets = UIEdgeInsetsMake(0,-15,15); UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithCustomView:button]; return item; } - (UIBarButtonItem *)rightButton { UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0,15,-15); UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithCustomView:button]; return item; }