編寫簡單的翻頁效果

翻頁效果，類似下面的樣子：

在電子書應用中會很常見。這裡需要兩個要點：

先說一下輕掃（swipe）的實現，可以參考編寫簡單的手勢示例：tap了解手勢種類。

在viewdidload方法中註冊了對上、下、左、右四個方向輕鬆的處理方法：

- (void)viewdidload {

uiswipegesturerecognizer *recognizer;

recognizer = [[uiswipegesturerecognizer alloc] initwithtarget:self action:@selector(handleswipefrom:)];

[recognizer setdirection:(uiswipegesturerecognizerdirectionright)];

[[self view] addgesturerecognizer:recognizer];

[recognizer release];

recognizer = [[uiswipegesturerecognizer alloc] initwithtarget:self action:@selector(handleswipefrom:)];

[recognizer setdirection:(uiswipegesturerecognizerdirectionup)];

[[self view] addgesturerecognizer:recognizer];

[recognizer release];

recognizer = [[uiswipegesturerecognizer alloc] initwithtarget:self action:@selector(handleswipefrom:)];

[recognizer setdirection:(uiswipegesturerecognizerdirectiondown)];

[[self view] addgesturerecognizer:recognizer];

[recognizer release];

recognizer = [[uiswipegesturerecognizer alloc] initwithtarget:self action:@selector(handleswipefrom:)];

[recognizer setdirection:(uiswipegesturerecognizerdirectionleft)];

[[self view] addgesturerecognizer:recognizer];

[recognizer release];

[super viewdidload];

在該方法中，再識別具體是哪個方向的輕掃手勢，比如判斷是向下的輕掃：

-(void)handleswipefrom:(uiswipegesturerecognizer *)recognizer {

nslog(@"swipe received.");

if (recognizer.direction==uiswipegesturerecognizerdirectiondown) {

nslog(@"swipe down");

if (recognizer.direction==uiswipegesturerecognizerdirectionup) {

nslog(@"swipe up");

[uiview beginanimations:@"animationid" context:nil];

[uiview setanimationduration:0.7f];

[uiview setanimationcurve:uiviewanimationcurveeaseinout];

[uiview setanimationrepeatautoreverses:no];

[uiview setanimationtransition:uiviewanimationtransitioncurldown forview:self.view cache:yes];

[currentview removefromsuperview];

[self.view addsubview:contentview];

[uiview commitanimations];

[uiview beginanimations:@"animationid" context:nil];

[uiview setanimationduration:0.7f];

[uiview setanimationcurve:uiviewanimationcurveeaseinout];

[uiview setanimationrepeatautoreverses:no];

[uiview setanimationtransition:uiviewanimationtransitioncurlupforview:self.view cache:yes];

[currentview removefromsuperview];

[self.view addsubview:contentview];

[uiview commitanimations];

儲存在resources下。

為了能讓上頁下頁翻頁的時候找到關聯的頁面，採用了如下機制：

比如這樣，當應用載入的時候顯示第一頁：

在翻頁時的處理：

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