通过分类(Category)更改UINavigationItem位置，LeftBarButtonItem，RightBarButtonItem位置

最新推荐文章于 2022-02-03 16:38:54 发布

写代码的MonkeyKing

最新推荐文章于 2022-02-03 16:38:54 发布

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文章标签： iOS UINavigationItem

本文链接：https://blog.youkuaiyun.com/hou3035/article/details/51441684

本文介绍了如何通过自定义扩展UINavigationItem，结合全局变量iCurrentIsImageCame，来改变LeftBarButtonItem和RightBarButtonItem的位置，特别是在解决系统相册页面取消按钮位置问题时的应用。

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在AppDelegate设置一个全局属性，iCurrentIsImageCame默认设置为NO,用此方法更改位置会修改系统相册页面取消按钮位置，只需在进入此页面时讲iCurrentIsImageCame设置为YES，就可解决取消按钮位置问题。

@implementation UINavigationItem (MyItem)

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_7_0

- (void)setLeftBarButtonItem:(UIBarButtonItem *)_leftBarButtonItem{

UIBarButtonItem *spaceButtonItem = [[UIBarButtonItemalloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpacetarget:nilaction:nil];

AppDelegate* app = (AppDelegate*)[UIApplicationsharedApplication].delegate;

if (app.iCurrentIsImageCame ==NO) {

spaceButtonItem.width = -15;

}

if (_leftBarButtonItem){

[selfsetLeftBarButtonItems:@[spaceButtonItem, _leftBarButtonItem]];

} else {

[selfsetLeftBarButtonItems:@[spaceButtonItem]];

}

- (void)setRightBarButtonItem:(UIBarButtonItem *)_rightBarButtonItem{

UIBarButtonItem *spaceButtonItem = [[UIBarButtonItemalloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpacetarget:nilaction:nil];

AppDelegate* app = (AppDelegate*)[UIApplicationsharedApplication].delegate;

if (app.iCurrentIsImageCame ==NO)

{

spaceButtonItem.width = -6;

}

if (_rightBarButtonItem) {

[selfsetRightBarButtonItems:@[spaceButtonItem, _rightBarButtonItem]animated:NO];

} else {

[selfsetRightBarButtonItems:@[spaceButtonItem]animated:NO];

}

-(void)setRightBarButtonItems:(NSArray *)rightBarButtonItems

{

UIBarButtonItem *spaceButtonItem = [[UIBarButtonItemalloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpacetarget:nilaction:nil];

AppDelegate* app = (AppDelegate*)[UIApplicationsharedApplication].delegate;

if (app.iCurrentIsImageCame ==NO)

{

spaceButtonItem.width = -6;

}

if (rightBarButtonItems) {

NSMutableArray * itemArr = [NSMutableArrayarrayWithArray:rightBarButtonItems];

[itemArr insertObject:spaceButtonItematIndex:0];

[selfsetRightBarButtonItems:itemArr animated:NO];

} else {

[selfsetRightBarButtonItems:@[spaceButtonItem]animated:NO];

}

#endif