目標：
- 延續前例
- 建立 singleton class 作為全域變數的儲存空間
- 在 HomeView 增加一個 TextField 供輸入文字，離開 HomeView 前往 SecondView 之前，將 TextField 中的文字存到 singleton class 中
- 當 View 切換到 SecondView，從 singleton class 中將剛剛存進去的資料讀出來，放到 Label
說明：
- 建立 singleton class：
#import <Foundation/Foundation.h>
@interface BPGblShareData : NSObject{
}
@property (nonatomic, retain) NSString * textFieldText;
+(id) sharedManager;
@end
BPGblShareData.m
#import "BPGblShareData.h"
@implementation BPGblShareData
@synthesize textFieldText;
#pragma mark Singleton Methods
+(id) sharedManager{
// 網路上大部份的人這樣做
//@synchronized(self){
// if(bpGblShareData == nil)
// bpGblShareData = [[self alloc] init];
//}
// 提醒到，Apple 的文件建議這樣做
static dispatch_once_t pred;
static BPGblShareData * bpGblShareData;
dispatch_once(&pred , ^{
bpGblShareData = [[BPGblShareData alloc] init];
});
return bpGblShareData;
}
-(id)init{
if(self = [super init]){
textFieldText = @"";
}
return self;
}
-(void) dealloc{
//用不到，放著
}
@end
- 編輯 HomeViewController.h 增加這一行
@property (nonatomic, strong) UITextView * textbox;
- 編輯 HomeViewController.m
#import "HomeViewController.h"
#import "SecondViewController.h"
#import "BPGblShareData.h"
@implementation HomeViewController
@synthesize label;
@synthesize button;
@synthesize textbox;
SecondViewController * secondViewController;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (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.
}
#pragma mark - View lifecycle
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
}
*/
- (void)viewDidLoad
{
CGRect frame = CGRectMake(20, 10, 280, 50);
label = [[UILabel alloc] initWithFrame:frame];
label.textAlignment = UITextAlignmentCenter;
label.font = [UIFont fontWithName:@"Verdana" size:20];
label.text = @"Hello World !!!";
// add first button
frame = CGRectMake(20, 160, 280, 50);
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = frame;
button.backgroundColor = [UIColor clearColor];
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[button setTitle:@"這是按鈕" forState:UIControlStateNormal];
// action handler for button
[button addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
//add textview
frame = CGRectMake(20, 70, 280, 50);
textbox = [[UITextView alloc] initWithFrame:frame];
[textbox setBackgroundColor:[UIColor lightGrayColor]];
[textbox setFont:[UIFont fontWithName:@"arial" size:30.0]];
//add subviews
[self.view addSubview:label];
[self.view addSubview:button];
[self.view addSubview:textbox];
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
-(void) btnClicked:(id) sender{
NSLog(@"button clicked !!");
// 將 TextView 裡面的資料存到全域變數區裡
BPGblShareData * gblSharedData = [BPGblShareData sharedManager];
gblSharedData.textFieldText = self.textbox.text;
secondViewController = [[SecondViewController alloc] initWithNibName:nil bundle:nil];
[UIView beginAnimations:@"flipping view" context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationCurve:UIViewAnimationOptionTransitionNone];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view.superview cache:NO];
[self.view.superview addSubview:secondViewController.view];
//要把自己移除，否則會留下『殘影』
[self.view removeFromSuperview];
[UIView commitAnimations];
}
@end
- 編輯 SecondViewController.m
#import "SecondViewController.h"
#import "HomeViewController.h"
#import "BPGblShareData.h"
@implementation SecondViewController
@synthesize labelOn2ndView = _labelOn2ndView;
@synthesize btnOn2ndView = _btnOn2ndView;
HomeViewController *homeViewController;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (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.
}
#pragma mark - View lifecycle
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
}
*/
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
//=========================================================================
//這是我的練習
//加一個 Label View
CGRect frame = CGRectMake(20, 10, 280, 50);
self.labelOn2ndView = [[UILabel alloc] initWithFrame:frame];
self.labelOn2ndView.textAlignment = UITextAlignmentCenter;
self.labelOn2ndView.font = [UIFont fontWithName:@"Verdana" size:20];
//取得 HomeViewController 傳出來的資料
BPGblShareData * gblSharedData = [BPGblShareData sharedManager];
self.labelOn2ndView.text = gblSharedData.textFieldText;
//加入第一個 ButtonView
frame = CGRectMake(20, 160, 280, 50);
self.btnOn2ndView = [UIButton buttonWithType:UIButtonTypeRoundedRect];
self.btnOn2ndView.frame = frame;
[self.btnOn2ndView setTitle:@"回到 Hello World" forState:UIControlStateNormal];
self.btnOn2ndView.backgroundColor = [UIColor clearColor];
//讓按鈕有生命，當按鈕被按到就呼叫 btn2Pressed 這個動作
[self.btnOn2ndView addTarget:self action:@selector(btn2Pressed:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.labelOn2ndView];
[self.view addSubview:self.btnOn2ndView];
//=========================================================================
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
-(void)btn2Pressed:(id)sender{
NSLog(@"2ndView btn Pressed");
homeViewController = [[HomeViewController alloc] initWithNibName:nil bundle:nil];
[UIView beginAnimations:@"flipping view" context:nil];
[UIView beginAnimations:@"switch view" context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view.superview cache:NO];
[self.view.superview addSubview:homeViewController.view];
//要把自己移除，否則會留下『殘影』
[self.view removeFromSuperview];
[UIView commitAnimations];
}
@end
沒有留言:
張貼留言