IOS UI 第四篇：基本UI

ViewController 應用  再第一個XIB頁面建立另一個XIB頁面，並且通過按鈕調用它  - (IBAction)GoSecond:(id)sender {    secondViewController *secVC = [[secondViewController alloc] initWithNibName:@"secondViewController" bundle:nil];    secVC.modalTransitionStyle = UIModalPresentationPageSheet;    [self presentViewController:secVC animated:YES completion:^{        NSLog(@"success ");    }];} 在第二個XIB頁面建立一個按鈕，按鈕PRESS返回第一個頁面  - (IBAction)Backfirst:(id)sender {    [self dismissViewControllerAnimated:YES completion:^{        NSLog(@"dismiss");    }];}  創造生命週期函數：  -(void)viewWillAppear:(BOOL)animated{    [super viewWillAppear:animated];    NSLog(@"view will appear");}-(void)viewDidAppear:(BOOL)animated{    [super viewDidAppear:animated];    NSLog(@"view did appear");}-(void)viewWillDisappear:(BOOL)animated{    [super viewWillDisappear:animated];    NSLog(@"view will disappear");}-(void)viewDidDisappear:(BOOL)animated{    [super viewDidDisappear:animated];    NSLog(@"view did disappear");}  頁面切換方法：        secVC.modalTransitionStyle = UIModalPresentationPageSheet;    UIModalPresentationFullScreen = 0,#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_3_2    UIModalPresentationPageSheet,    UIModalPresentationFormSheet,    UIModalPresentationCurrentContext,#endif#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_7_0    UIModalPresentationCustom,    UIModalPresentationNone = -1,