ios5及其以后提供了一個比較強大的工具uiappearance，我們通過uiappearance設(shè)置一些ui的全局效果，這樣就可以很方便的實現(xiàn)ui的自定義效果又能最簡單的實現(xiàn)統(tǒng)一界面風(fēng)格，它提供如下兩個方法。

+ (id)appearance

這個方法是統(tǒng)一全部改，比如你設(shè)置uinavbar的tintcolor，你可以這樣寫：[[uinavigationbar appearance] settintcolor:mycolor];

+ (id)appearancewhencontainedin:(class <>)containerclass,...

這個方法可設(shè)置某個類的改變：例如：設(shè)置uibarbuttonitem 在uinavigationbar、uipopovercontroller、uitabbar中的效果。就可以這樣寫

[[uibarbuttonitem appearancewhencontainedin:[uinavigationbar class], [uipopovercontroller class],[uitabbar class] nil] settintcolor:mypopovernavbarcolor];

請注意＊使用appearance設(shè)置ui效果最好采用全局的設(shè)置，在所有界面初始化前開始設(shè)置，否則可能失效。

支持uiappearance協(xié)議的類可以訪問appearance selector ,它為receiver返回appearance proxy，我么可以給proxy發(fā)一些消息，諸如settintcolor:等

但是它并不是支持所有的ui類。下面列出它支持的類

1.uiactivitiindicatorview

2.uibarbuttonitem

3.uibaritem

4.uinavgationbar

5.uipopovercontroll

6.uiprogressview

7.uisearchbar

8.uisegmentcontroll

9.uislider

10.uiswitch

11.uitabbar

12.uitabbaritem

13.uitoolbar

14.uiview

15.uiviewcontroller

具體ui外觀修改如下：

1.修改導(dǎo)航欄背景

代碼如下:

uinavigationbar * appearance = [uinavigationbar appearance];

uiimage *navbackgroundimg =[uiimage imagenamed:@navbg.png”];

[appearance setbackgroundimage:navbackgroundimgforbarmetrics:uibarmetricsdefault];

2.標(biāo)簽欄（uitabbar）

代碼如下:

uitabbar *appearance = [uitabbar appearance];

//設(shè)置背景圖片

[appearance setbackgroundimage:[uiimage imagenamed:@tabbar_bg.png]];

//門置選擇item的背景圖片

uiimage * selectionindicatorimage =[[uiimageimagenamed:@tabbar_slider]resizableimagewithcapinsets:uiedgeinsetsmake(4, 0, 0,0)] ;

[appearance setselectionindicatorimage:selectionindicatorimage];

3.分段控件（uisegmentcontrol）

代碼如下:

uisegmentedcontrol *appearance = [uisegmentedcontrol appearance];

//segmenteg正常背景

[appearance setbackgroundimage:[uiimage imagenamed:@segmente.png]

forstate:uicontrolstatenormal

barmetrics:uibarmetricsdefault];

//segmente選中背景

[appearance setbackgroundimage:[uiimage imagenamed:@segmente_a.png]

forstate:uicontrolstateselected

barmetrics:uibarmetricsdefault];

//segmente左右都未選中時的分割線

//barmetrics表示navigation bar的狀態(tài)，uibarmetricsdefault 表示portrait狀態(tài)（44pixel height），uibarmetricslandscapephone 表示landscape狀態(tài)（32pixel height）

[appearance setdividerimage:[uiimage imagenamed:@segmente_line.png]

forleftsegmentstate:uicontrolstatenormal

rightsegmentstate:uicontrolstatenormal

barmetrics:uibarmetricsdefault];

[appearance setdividerimage:[uiimage imagenamed:@segmente_line.png]

forleftsegmentstate:uicontrolstateselected

rightsegmentstate:uicontrolstatenormal

barmetrics:uibarmetricsdefault];

[appearance setdividerimage:[uiimage imagenamed:@segmente_line.png]

forleftsegmentstate:uicontrolstatenormal

rightsegmentstate:uicontrolstateselected

barmetrics:uibarmetricsdefault];

//字體

nsdictionary *textattributes1 = @{uitextattributefont: [uifont systemfontofsize:18],

uitextattributetextcolor: [uicolor bluecolor],

uitextattributetextshadowcolor: [uicolor whitecolor],

uitextattributetextshadowoffset: [nsvaluevaluewithcgsize:cgsizemake(1, 1)]};

[appearance settitletextattributes:textattributes1 forstate:1];

nsdictionary *textattributes2 = @{uitextattributefont: [uifont systemfontofsize:18],

uitextattributetextcolor: [uicolor whitecolor],

uitextattributetextshadowcolor: [uicolor blackcolor],

uitextattributetextshadowoffset: [nsvaluevaluewithcgsize:cgsizemake(1, 1)]};

[appearance settitletextattributes:textattributes2 forstate:0];

4.uibarbutton

注意：uibarbutton有l(wèi)eftbarbutton，rightbarbutton和backbarbutton，其中backbarbutton由于帶有箭頭，需要單獨設(shè)置。

barbutton背景設(shè)置是ios6.0及以后的，而backbutton是ios5.0及以后的，這里要注意！

代碼如下:

//修改導(dǎo)航條上的uibarbuttonitem

uibarbuttonitem *appearance = [uibarbuttonitem appearancewhencontainedin:[uinavigationbar class], nil];

//設(shè)置導(dǎo)航欄的字體包括backbarbutton和leftbarbutton，rightbarbutton的字體

nsdictionary *textattributes = @{uitextattributefont: [uifontsystemfontofsize:18],

uitextattributetextcolor: [uicolorbluecolor],

uitextattributetextshadowcolor: [uicolorwhitecolor],

uitextattributetextshadowoffset: [nsvaluevaluewithcgsize:cgsizemake(1, 1)]};

[appearance settitletextattributes:textattributes forstate:1];//forstate為0時為下正常狀態(tài)，為1時為點擊狀態(tài)。

//修改leftbarbutton，rightbarbutton背景效果

[appearance setbackgroundimage:[uiimage imagenamed:@navbarbutton.png]

forstate:uicontrolstatenormal

style:uibarbuttonitemstylebordered

barmetrics:uibarmetricsdefault];

[appearance setbackgroundimage:[uiimage imagenamed:@navbarbutton_a.png]

forstate:uicontrolstatehighlighted

style:uibarbuttonitemstylebordered

barmetrics:uibarmetricsdefault];

//backbarbutton需要單獨設(shè)置背景效果。只能在ios6.0以后才能用

[appearance setbackbuttonbackgroundimage:[uiimage imagenamed:@nav_bg.png]

forstate:0

barmetrics:uibarmetricsdefault];

[appearance setbackbuttonbackgroundimage:[uiimage imagenamed:@work.png]

forstate:1

barmetrics:uibarmetricsdefault];

[appearance setbackbuttontitlepositionadjustment:uioffsetmake(2, -1)

forbarmetrics:uibarmetricsdefault];

5.工具欄（uitoolbar）

uitoolbar *appearance = [uitoolbar appearance];

//樣式和背景二選一即可，看需求了

//樣式（黑色半透明，不透明等）設(shè)置

[appearance setbarstyle:uibarstyleblacktranslucent];

//背景設(shè)置

[appearance setbackgroundimage:[uiimage imagenamed:@toolbarbg.png]

fortoolbarposition:uitoolbarpositionany

barmetrics:uibarmetricsdefault];

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