IOS 入門(mén)開(kāi)發(fā)之創(chuàng)建標(biāo)題欄UINavigationBar的使用

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??? IOS 開(kāi)發(fā)有關(guān)界面的東西不僅可以使用代碼來(lái)編寫(xiě)，也可以使用Interface Builder可視化工具來(lái)編寫(xiě)。今天有個(gè)朋友問(wèn)我這兩個(gè)有什么區(qū)別，首先說(shuō) 說(shuō)IB ，使用它編輯出來(lái)的控件其實(shí)底層還是調(diào)用代碼只是蘋(píng)果封裝出來(lái)讓開(kāi)發(fā)者更好使用而已。它的優(yōu)點(diǎn)是方便、快捷最重要的是安全，因?yàn)榭丶尼尫潘鼤?huì)幫我們完成 不用手動(dòng)釋放。缺點(diǎn)是多人開(kāi)發(fā)不好維護(hù)，就好比誰(shuí)寫(xiě)的IB誰(shuí)能看懂，別人看的話就比較費(fèi)勁，不利于代碼的維護(hù)。兩種方式各有利弊，不過(guò)我個(gè)人還是比較喜歡 純代碼，因?yàn)槿魏纬绦蛘Z(yǔ)言，或者任何腳本語(yǔ)言，代碼和可視化工具比起來(lái)永遠(yuǎn)是最底層的。

利用代碼在屏幕中添加一個(gè)標(biāo)題欄，并且在標(biāo)題欄左右兩方在添加兩個(gè)按鈕，點(diǎn)擊后響應(yīng)這兩個(gè)按鈕。
這里設(shè)置標(biāo)題欄的顯示范圍。

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//創(chuàng)建一個(gè)導(dǎo)航欄?

UINavigationBar?*navigationBar?=?[[UINavigationBar?alloc]?initWithFrame:CGRectMake(0,?0,?320,?44)];??

? 有了標(biāo)題欄后，須要在標(biāo)題欄上添加一個(gè)集合Item用來(lái)放置 標(biāo)題內(nèi)容，按鈕等。

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//創(chuàng)建一個(gè)導(dǎo)航欄集合?

UINavigationItem?*navigationItem?=?[[UINavigationItem?alloc]?initWithTitle:nil];??

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在這個(gè)集合Item中添加標(biāo)題，按鈕。

style:設(shè)置按鈕的風(fēng)格，一共有3中選擇。
action:@selector:設(shè)置按鈕點(diǎn)擊事件。

//創(chuàng)建一個(gè)左邊按鈕?

??UIBarButtonItem?*leftButton?=?[[UIBarButtonItem?alloc]?initWithTitle:@"左邊"????

????????????????????????????????????????????????????????????style:UIBarButtonItemStyleBordered????

????????????????????????????????????????????????????????????target:self????

????????????????????????????????????????????????????????????action:@selector(clickLeftButton)];???

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??//創(chuàng)建一個(gè)右邊按鈕?

??UIBarButtonItem?*rightButton?=?[[UIBarButtonItem?alloc]?initWithTitle:@"右邊"????

????????????????????????????????????????????????????????????????style:UIBarButtonItemStyleDone????

????????????????????????????????????????????????????????????????target:self????

????????????????????????????????????????????????????????????????action:@selector(clickRightButton)];???

??//設(shè)置導(dǎo)航欄內(nèi)容?

??[navigationItem?setTitle:@"雨松MOMO程序世界"];?

將標(biāo)題欄中的內(nèi)容全部添加到主視圖當(dāng)中。

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//把導(dǎo)航欄添加到視圖中?

[self.view?addSubview:navigationBar];???

最后將控件在內(nèi)存中釋放掉，避免內(nèi)存泄漏。

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//釋放對(duì)象?

[navigationItem?release];???

[leftButton?release];???

[rightButton?release];?

如圖所示：添加這兩個(gè)按鈕的點(diǎn)擊響應(yīng)事件。

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-(void)clickLeftButton?

{?

?????

????[self?showDialog:@"點(diǎn)擊了導(dǎo)航欄左邊按鈕"];?

???

}?

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-(void)clickRightButton?

{?

?????

????[self?showDialog:@"點(diǎn)擊了導(dǎo)航欄右邊按鈕"];?

?????

}?

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點(diǎn)擊后打開(kāi)一個(gè)Dialog對(duì)話框，根據(jù)點(diǎn)擊不同的按鈕傳入不同的顯示內(nèi)容。
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-(void)showDialog:(NSString?*)?str?

{?

????

????UIAlertView?*?alert=?[[UIAlertView?alloc]?initWithTitle:@"這是一個(gè)對(duì)話框"?message:str?delegate:self?cancelButtonTitle:@"確定"?otherButtonTitles:?nil];?????

????

????[alert?show];???????

????[alert?release];?

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最后貼上完整的代碼

#import?"TitleViewController.h"?

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@implementation?TitleViewController?

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-?(void)didReceiveMemoryWarning?

{?

????//?Releases?the?view?if?it?doesn't?have?a?superview.?

????[super?didReceiveMemoryWarning];?

?????

????//?Release?any?cached?data,?images,?etc?that?aren't?in?use.?

}?

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#pragma?mark?-?View?lifecycle?

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//?Implement?viewDidLoad?to?do?additional?setup?after?loading?the?view,?typically?from?a?nib.?

-?(void)viewDidLoad?

{?

????[super?viewDidLoad];?

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????//創(chuàng)建一個(gè)導(dǎo)航欄?

????UINavigationBar?*navigationBar?=?[[UINavigationBar?alloc]?initWithFrame:CGRectMake(0,?0,?320,?44)];???

?????

????//創(chuàng)建一個(gè)導(dǎo)航欄集合?

????UINavigationItem?*navigationItem?=?[[UINavigationItem?alloc]?initWithTitle:nil];???

?????

????//創(chuàng)建一個(gè)左邊按鈕?

????UIBarButtonItem?*leftButton?=?[[UIBarButtonItem?alloc]?initWithTitle:@"左邊"????

??????????????????????????????????????????????????????????????style:UIBarButtonItemStyleBordered????

??????????????????????????????????????????????????????????????target:self????

??????????????????????????????????????????????????????????????action:@selector(clickLeftButton)];???

?

????//創(chuàng)建一個(gè)右邊按鈕?

????UIBarButtonItem?*rightButton?=?[[UIBarButtonItem?alloc]?initWithTitle:@"右邊"????

??????????????????????????????????????????????????????????????????style:UIBarButtonItemStyleDone????

??????????????????????????????????????????????????????????????????target:self????

??????????????????????????????????????????????????????????????????action:@selector(clickRightButton)];???

????//設(shè)置導(dǎo)航欄內(nèi)容?

????[navigationItem?setTitle:@"雨松MOMO程序世界"];?

?????

?????

????//把導(dǎo)航欄集合添加入導(dǎo)航欄中，設(shè)置動(dòng)畫(huà)關(guān)閉?

????[navigationBar?pushNavigationItem:navigationItem?animated:NO];??

?????

????//把左右兩個(gè)按鈕添加入導(dǎo)航欄集合中?

????[navigationItem?setLeftBarButtonItem:leftButton];??

????[navigationItem?setRightBarButtonItem:rightButton];?

??????

????//把導(dǎo)航欄添加到視圖中?

????[self.view?addSubview:navigationBar];???

?????

?????

????//釋放對(duì)象?

????[navigationItem?release];???

????[leftButton?release];???

????[rightButton?release];?

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}?

?

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-(void)clickLeftButton?

{?

?????

????[self?showDialog:@"點(diǎn)擊了導(dǎo)航欄左邊按鈕"];?

???

}?

?

?

-(void)clickRightButton?

{?

?????

????[self?showDialog:@"點(diǎn)擊了導(dǎo)航欄右邊按鈕"];?

?????

}?

?

?

-(void)showDialog:(NSString?*)?str?

{?

????

????UIAlertView?*?alert=?[[UIAlertView?alloc]?initWithTitle:@"這是一個(gè)對(duì)話框"?message:str?delegate:self?cancelButtonTitle:@"確定"?otherButtonTitles:?nil];?????

????

????[alert?show];???????

????[alert?release];?

}?

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-?(void)viewDidUnload?

{?

????[super?viewDidUnload];?

????//?Release?any?retained?subviews?of?the?main?view.?

????//?e.g.?self.myOutlet?=?nil;?

}?

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-?(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation?

{?

????//?Return?YES?for?supported?orientations?

????return?(interfaceOrientation?==?UIInterfaceOrientationPortrait);?

}?

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@end?

轉(zhuǎn)載于:https://www.cnblogs.com/yulang314/p/3568380.html

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