[iOS]自定義NavigationController的一般過(guò)程
在項(xiàng)目中蛇受,我們經(jīng)常會(huì)使用UINavigationController來(lái)管理一組控制器,但是,如果我們使用系統(tǒng)自帶的NavigationController盏浇,可能會(huì)造成許多意想不到的問(wèn)題,比如說(shuō)返回手勢(shì)的失效芽狗,NavigationBar顏色設(shè)置的不一致(由于透明度造成)缠捌,或者是當(dāng)NavigationController嵌套在UITabbarController中使用時(shí),在push過(guò)程中译蒂,tabor何時(shí)消失的不確定等等問(wèn)題,所以我們經(jīng)常使用自定義的NavigationController來(lái)控制一組控制器谊却,過(guò)程如下:
1.繼承UINavigationController來(lái)實(shí)現(xiàn)自己的NavigationController柔昼。
2.解決返回手勢(shì)失敗的問(wèn)題。
3.解決NavigationBar顏色設(shè)置不一致的問(wèn)題炎辨。
4.解決push時(shí)隱藏Tabbar捕透。
5.設(shè)置整個(gè)NavigationController狀態(tài)欄的樣式,注意:在iOS7之后碴萧,修改狀態(tài)欄樣式的方法不被提供了乙嘀,而是改為了控制器自己重寫(xiě)方法
- (UIStatusBarStyle
)preferredStatusBarStyle;來(lái)實(shí)現(xiàn)。但是如果控制器被NavigationController所管理破喻,那么該方法只會(huì)調(diào)用一次虎谢,即調(diào)用棧底層的控制器的該方法,其他控制器的該方法會(huì)被截?cái)唷?/li>
首先先說(shuō)第一點(diǎn)曹质,這一個(gè)很簡(jiǎn)單婴噩,直接創(chuàng)建一個(gè)繼承自UINavigationController的控制器即可,例如我的MDMNavigationController羽德。代碼如下:.h文件
</pre><p style="margin-top: 0px; margin-bottom: 22px; padding-top: 0px; padding-bottom: 0px; color: rgb(51, 51, 51); font-family: 'Microsoft Yahei', Simsun; font-size: 17px;"></p><p style="margin-top: 0px; margin-bottom: 22px; padding-top: 0px; padding-bottom: 0px; color: rgb(51, 51, 51); font-family: 'Microsoft Yahei', Simsun; font-size: 17px;">第二點(diǎn):解決返回手勢(shì)失效的問(wèn)題我們可以定義一個(gè)屬性來(lái)保存NavigationController的interactivePopGestureRecognizer的delegate來(lái)解決該問(wèn)題几莽,代碼如下:</p><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-size: 17px;"><code></code>
@interface
MDMNavigationController ()<<span se-mark="1">UINavigationControllerDelegate>@property (nonatomic, weak) idPopDelegate;@end@implementation MDMNavigationController- (void)viewDidLoad { [super viewDidLoad]; self.PopDelegate =self.interactivePopGestureRecognizer.delegate; self.delegate = self; } - (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated { if (viewController == self.viewControllers[0]) {self.interactivePopGestureRecognizer.delegate = self.PopDelegate; }else{self.interactivePopGestureRecognizer.delegate = nil; } }@end
第三點(diǎn):解決NavigationBar顏色設(shè)置不一致的問(wèn)題,該問(wèn)題主要是因?yàn)镹avigationBar有透明度導(dǎo)致的宅静,下面代碼的方法比較實(shí)用:
@implementation
UINavigationBar (BackgroundColor)static char overlayKey; - (UIView *)overlay { return objc_getAssociatedObject(self, &overlayKey); } - (void)setOverlay:(UIView*)overlay{ objc_setAssociatedObject(self, &overlayKey, overlay, OBJC_ASSOCIATION_RETAIN_NONATOMIC); } - (void)lt_setBackgroundColor:(UIColor *)backgroundColor { if (!self.overlay) { [self setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault]; [self setShadowImage:[[UIImage alloc] init]]; self.overlay = [[UIView alloc] initWithFrame:CGRectMake(0, -20, [UIScreen mainScreen].bounds.size.width, 64)];self.overlay.userInteractionEnabled = NO; [self insertSubview:self.overlayatIndex:0]; } self.overlay.backgroundColor = backgroundColor; }
@end
然后在合適位置設(shè)置顏色即可:
- (void
)viewDidLoad { [super viewDidLoad]; self.PopDelegate =self.interactivePopGestureRecognizer.delegate; self.delegate = self; [self.navigationB
第四點(diǎn):解決push時(shí)隱藏Tabbar章蚣,這個(gè)就比較簡(jiǎn)單了,代碼如下:
- (void
)pushViewController:(UIViewController *)viewController animated:(BOOL)animated { if (self.viewControllers.count > 0) { viewController.hidesBottomBarWhenPushed = YES; } [superpushViewController:viewCo
第五點(diǎn):設(shè)置狀態(tài)欄樣式姨夹,代碼如下:
- (void
)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated { UIBarButtonItem *backBarButtonItem = [[UIBarButtonItemalloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:selfaction:@selector(backBarButtonItemAction)]; viewController.navigationItem.backBarButtonItem = backBarButtonItem; } - (void)backBarButtonItemAction { [self popViewControllerAnimated:YES]; }
這樣下來(lái)纤垂,我們就完成了一個(gè)比較實(shí)用的自定義的NavigationController的設(shè)置了矾策,然后去自己的項(xiàng)目中使用吧