iOS viewController添加導(dǎo)航條添加跳轉(zhuǎn)以及特效

2019-11-09 16:42:07

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來源：轉(zhuǎn)載

供稿：網(wǎng)友

給單獨(dú)的viewcontroller或者在Appdelegate的主頁面添加導(dǎo)航條，只要在viewcontroller上添加navigationcontroller，在添加此navigationcontroller即可

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];

ViewController *mainView = [[ViewController alloc]init];

UINavigationController *navi = [[UINavigationController alloc]initWithRootViewController:mainView];

navi.navigationBar.backgroundColor = [UIColor blueColor];

[self.window setRootViewController:navi];

[self.window makeKeyAndVisible];

return YES;

}

導(dǎo)航條的字體和顏色的設(shè)置

self.navigationController.navigationBar.titleTextAttributes = [NSDictionary dictionaryWithObject:[UIColor whiteColor] forKey:UITextAttributeTextColor]; // --- 字體顏色

[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"BJ.png"] forBarMetrics:UIBarMetricsDefault]; // — 背景色

導(dǎo)航條跳轉(zhuǎn)頁面的考慮對于用navigationcontroller來跳轉(zhuǎn)頁面的時(shí)候，其實(shí)是執(zhí)行堆棧的進(jìn)棧和出棧的操作，要想釋放內(nèi)存，那么在來回跳轉(zhuǎn)的時(shí)候，就要考慮幾個(gè)問題了1 A =>B=>C=>D,D=>A 有根視圖的話（HOME）[self.navigationController popToRootViewControllerAnimated:YES]; D=>C （每一個(gè)界面返回上一層）[self.navigationController popViewControllerAnimated:YES]; 返回到上一層，并且傳遞參數(shù)

//此頁面已經(jīng)存在于self.navigationController.viewControllers中,并且是當(dāng)前頁面的前一頁面

CViewController *cvc = [self.navigationController.viewControllers objectAtIndex:self.navigationController.viewControllers.count-

2];CViewController *cvc = [CViewController alloc]init];cvc.str = self.str;[self.navigationController popToViewController:cvc animated:true];返回到上一層后，上一頁面顯示后要接收參數(shù)，并刷新。注意此時(shí)應(yīng)該在viewDidAppear中進(jìn)行判斷并接收傳遞的值-(void)viewDidAppear:(BOOL)animated{ //判斷并接收返回的參數(shù)}2 A =>B=>C=>D=>E,E=>B=>C=>E因?yàn)锽在之前已經(jīng)出現(xiàn)過，不能在E中直接PUSH到B，因?yàn)槟菢右呀?jīng)是兩個(gè)B了，增加內(nèi)存，所以在跳轉(zhuǎn)的時(shí)候，就要進(jìn)行判斷是否之前已經(jīng)出現(xiàn)過B了，出現(xiàn)過，則直接push。這樣push到的是原有的B，不會在內(nèi)存中重新生成一個(gè)B了。

NSArray *array = self.navigationController.viewControllers;

for (UIViewController *vc in array) {

if ([vc isKindOfClass:[BXXXViewController class]]) {

push VC；

}

或者知道每個(gè)界面的指針

[self.navigationController

popToViewController: [self.navigationController.viewControllers

objectAtIndex: ([self.navigationController.viewControllers count] -4)]

animated:YES];

在使用時(shí)，根據(jù)自己返回層的需要，只要改變一下“－4”這個(gè)數(shù)字就可以達(dá)到目的了

//=====2016年3月17日增加導(dǎo)航條的變化 Xcode7.2

很多的應(yīng)用現(xiàn)在都做到了，隨著頁面的滑動導(dǎo)航條的顏色也會發(fā)生變化，現(xiàn)在使用原生的導(dǎo)航條來體現(xiàn)一下基本原理。。。

*在項(xiàng)目屬性里設(shè)置

View controller-based status bar appearance == NO 默認(rèn)是YES

才可以改變導(dǎo)航條上20像素位置的狀態(tài)欄顏色

干貨：

本例使用的 UITableView 添加KVO實(shí)現(xiàn)監(jiān)控滑動位置的變化

[_myTable addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNew| NSKeyValueObservingOptionInitial context:nil];

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context{ if ([keyPath isEqualToString:@"contentOffset"]) { [self navChange]; }}

-(void)navChange{ if (_myTable.contentOffset.y <= 64) { self.navigationController.navigationBar.titleTextAttributes = [NSDictionary dictionaryWithObject:[UIColor blueColor] forKey:NSForegroundColorAttributeName]; [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"BJ1.png"] forBarMetrics:UIBarMetricsDefault]; self.title = @"初始導(dǎo)航條"; } else if (_myTable.contentOffset.y >= 192 ) { self.navigationController.navigationBar.titleTextAttributes = [NSDictionary dictionaryWithObject:[UIColor whiteColor] forKey:NSForegroundColorAttributeName]; [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"BJ2.png"] forBarMetrics:UIBarMetricsDefault]; self.title = @"導(dǎo)航條最終狀態(tài)"; // 狀態(tài)欄顏色為白色 [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent; }else { self.navigationController.navigationBar.titleTextAttributes = [NSDictionary dictionaryWithObject:[UIColor redColor] forKey:NSForegroundColorAttributeName]; [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"BJ3.png"] forBarMetrics:UIBarMetricsDefault]; self.title = @"導(dǎo)航條中間狀態(tài)"; // 狀態(tài)欄顏色為白色 [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault; }}

上效果圖無圖無真相