【移动应用开发技术】iOS中UINavigationItem如何去除左右间隙

【移动应用开发技术】iOS中UINavigationItem如何去除左右间隙

修改思路/upload/information/20200623/126/120857.jpg核心代码//0:leftBarButtonItems,1:rightBarButtonItems

-

(void)initBarItem:(UIView*)view

withType:(int)type{

UIBarButtonItem

*

buttonItem

=

[[UIBarButtonItem

alloc]initWithCustomView:view];

//解决按钮不靠左

靠右的问题.iOS

11系统需要单独处理

UIBarButtonItem

*

spaceItem

=

[[UIBarButtonItem

alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace

target:nil

action:nil];

spaceItem.width

=

-16;//这个值可以根据自己需要自己调整

switch

(type)

{

case

0:

if

(!IS_IOS_VERSION_11)

{

self.navigationItem.leftBarButtonItems

=@[spaceItem,buttonItem];

}else{

self.navigationItem.leftBarButtonItems

=@[buttonItem];

}

break;

case

1:

if

(!IS_IOS_VERSION_11)

{

self.navigationItem.rightBarButtonItems

=@[spaceItem,buttonItem];

}else{

self.navigationItem.rightBarButtonItems

=@[buttonItem];

}

break;

default:

break;

}

}-(void)viewDidLayoutSubviews{

if

(!IS_IOS_VERSION_11)

return;

UINavigationItem

*

item=self.navigationItem;

NSArray

*

array=item.leftBarButtonItems;

if

(array&&array.count!=0){

//这里需要注意,你设置的第一个leftBarButtonItem的customeView不能是空的,也就是不要设置UIBarButtonSystemItemFixedSpace这种风格的item

UIBarButtonItem

*

buttonItem=array[0];

UIView

*

view

=[[[buttonItem.customView

superview]

superview]

superview];

NSArray

*

arrayConstraint=view.constraints;

for

(NSLayoutConstraint

*

constant

in

arrayConstraint)

{

if

(fabs(constant.constant)==16)

{

co