删除IOS7中导航栏上的左键前的空格？

Question

我可以实现导航栏并添加左栏按钮，但在左键有空格之前，请询问如何在ios 7中删除此空格。

Answer 1

使用它可以使用它我已经使用它并且在iOS 7上也能正常工作

UIBarButtonItem *homeButton = [[UIBarButtonItem alloc] initWithCustomView:segmentView];
UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]
                                   initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace
                                   target:nil action:nil];
   negativeSpacer.width = -6;// it was -6 in iOS 6  you can set this as per your preference
[self.navigationItem setLeftBarButtonItems:[NSArray arrayWithObjects:negativeSpacer,homeButton, nil] animated:NO];

Answer 2

您可以使用系统.fixedSpace UIBarButtonItem。

这是一个产生预期结果的快速版本（iOS 10 +）：

let negativeSpacer = UIBarButtonItem(barButtonSystemItem: .fixedSpace, target: nil, action: nil)
negativeSpacer.width = -20 // working on iOS 10.
let barButton = UIBarButtonItem(title: "<# title #>", style: .plain, target: <# target #> , action: #selector(<# action #>))
navigationItem.leftBarButtonItems = [negativeSpacer, barButton]

另一个想法是直接向UIButton添加UINavigationController.view。

Answer 3

我们可以添加导航栏的自定义左栏按钮，但在左键之前有空格。我将此问题修复如下，

<强>调用

//  MyViewController.m

- (void)viewDidLoad {
        UIBarButtonItem *bbBack = [Utilities overrideBackBarButtonItemWithTarget:self action:@selector(btnBackTapped:)];
}

- (void)btnBackTapped:(id)sender {
    //Custom navigation back bar button item
}

将此类方法添加到Utilities类或项目的任何公共类中，

<强>实施

//  Utilities.h

@interface Utilities : NSObject

#pragma mark - back bar button item
+(UIBarButtonItem*)overrideBackBarButtonItemWithTarget:(nullable id)target action:(nullable SEL)action;

@end


//  Utilities.m

@implementation Utilities

+(UIBarButtonItem*)overrideBackBarButtonItemWithTarget:(nullable id)target action:(nullable SEL)action  {

    // back button
    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 65 , 44)];
    [btn setImage:[UIImage imageNamed:@"back"] forState:UIControlStateNormal];
    btn.imageEdgeInsets = UIEdgeInsetsMake(0, -15, 0, 15);//move image to the right
    [btn addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *barbuttonBack = [[UIBarButtonItem alloc] initWithCustomView:btn];

        //navigation spacer
    UIBarButtonItem *spacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
    spacer.width = -15;// it was -6 in iOS 6  you can set this as per your preference

        //set leftBarButtonItems
    UIViewController *_self = (UIViewController*)target;
    [_self.navigationItem setLeftBarButtonItems:[NSArray arrayWithObjects:spacer,barbuttonBack, nil] animated:NO];

    return barbuttonBack;
}

@end

返回图片 back.png