我正在创建一个带有大量自定义 View 的 iOS 应用程序，因此，使用默认的 Cocoa View 不是一种选择。然后，我决定使用 协调/中介 Controller 设计模式(在 Apress - Pro Objective-C Design Patterns for iOS 中学习)。
从委托(delegate)中，我创建了一个 rootViewController 指向我的协调 Controller 中的 View :
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
coordinatingController = [C6CoordinatingController sharedInstance];
self.window.rootViewController = coordinatingController.activeVC;
[self.window makeKeyAndVisible];
return YES;
然后，在协调 Controller 中，我有单例创建方法:
+ (C6CoordinatingController *) sharedInstance{
if (sharedCoordinator == nil){
C6Log(@"New Shared Coordinator");
sharedCoordinator = [[super allocWithZone:NULL] init];
[sharedCoordinator initialize];
}
else {
C6Log(@"Return Singleton Shared Coordinator");
}
return sharedCoordinator;
}
+ (id) allocWithZone:(NSZone *)zone{
return [self sharedInstance];
}
- (void) initialize{
C6Log(@"");
[self checkDevice];
_mainVC = [C6MainViewController initWithDevice:device];
_activeVC = _mainVC;
[self checkLanguage];
[self chooseFirstView];
}
我还有一个选择器来选择第一个 View (我目前只有两个):
-(void) chooseFirstView{
// If a language was not setted, go to language settings view
if (!language) {
C6Log(@"Going to Language Settings");
C6LanguageSettingsViewController *languageVC = [C6LanguageSettingsViewController initWithDevice:device];
[_mainVC.view addSubview:languageVC.view];
}
else {
C6Log(@"Going to User Settings", language);
C6AccountSettingsViewController *accountVC = [C6AccountSettingsViewController initWithDevice:device];
[_mainVC.view addSubview:accountVC.view];
}
}
然后，我有一个 IBAction 供我的 View 使用:
- (IBAction) requestViewChangeByObject:(id)object {
int buttonTag = [object tag]; // dividend
int viewTag = buttonTag / divisor; // quotient
int actionTag = buttonTag - (divisor * viewTag); // remainder
C6Log(@"viewTag: %d | actionTag %d", viewTag, actionTag);
switch (viewTag) {
case LanguageTags:
C6Log(@"LanguageTags");
break;
case AccountTags:
C6Log(@"AccountTags");
break;
default:
break;
}
在 NIB 中，我创建了一个 Obect(协调 Controller )并从那里调用 IBAction。它工作得很好，我可以改变我的观点(它仍然需要实现)......
但是……我也想更改语言，但是，因为它不是导航问题，所以我想从 C6LanguageSettingsViewController 而不是从 C6CoodinatingController 来做。
所以，我在 C6LanguageSettingsViewController 中创建了另一个 IBAction:
- (IBAction)chooseLang:(id)sender{
UIImage *bt;
[self resetImagesToNormalState];
C6Log(@"");
C6Log(@"%@", [sender tag]);
C6Log(@"%@", sender);
.
.
.
当我将按钮连接到这个 IBAction(通过 File's Owner 或通过 LanguageSettingsViewController 对象)时，应用程序中断，有时它没有显示错误，有时它会显示 Unrecognized selector sent to instance OR EXC_BAD_ACCESS(代码=1，地址= 0x………) 在 UIApplicationMain 中。
我相信问题是 NIB 没有找到文件的所有者……但我不确定如何解决它。
最佳答案
好吧……这似乎很荒谬，但我在回答自己:P
我设法让它工作(最终!)，我发现我正在以 BAAAAD 的方式管理 viewControllers，所以，我在协调 Controller 中更改了一些代码:
首先，我不再有一个带有 NIB 和 stuf 的“真正的” mainViewController ......
OLD 初始化
- (void) initialize{
C6Log(@"");
[self checkDevice];
_mainVC = [C6MainViewController initWithDevice:device];
_activeVC = _mainVC;
[self checkLanguage];
[self chooseFirstView];
}
新初始化
- (void) initialize{
C6Log(@"");
[self checkDevice];
[self checkLanguage];
[self chooseFirstView];
}
checkDevice 验证它是 iPhone 还是 iPad，因此我可以选择正确的 NIB。
checkLanguage 检查语言的 [NSUserDefaults standardUserDefaults]
最后，我调用chooseFirstView:
OLD 选择FirstView
-(void) chooseFirstView{
// If a language was not setted, go to language settings view
if (!language) {
C6Log(@"Going to Language Settings");
C6LanguageSettingsViewController *languageVC = [C6LanguageSettingsViewController initWithDevice:device];
[_mainVC.view addSubview:languageVC.view];
}
else {
C6Log(@"Going to User Settings", language);
C6AccountSettingsViewController *accountVC = [C6AccountSettingsViewController initWithDevice:device];
[_mainVC.view addSubview:accountVC.view];
}
}
新的选择第一 View
-(void) chooseFirstView{
// If a language was not setted, go to language settings view
_activeVC = [[UIViewController alloc] init];
UIImage *bgImage = [UIImage imageNamed:@"bg.png"];
UIImageView *bgView = [[UIImageView alloc] initWithImage:bgImage];
[_activeVC.view addSubview:bgView];
if (!language) {
C6Log(@"Going to Language Settings");
languageVC = [C6LanguageSettingsViewController initWithDevice:device];
[_activeVC.view addSubview:languageVC.view];
}
else {
C6Log(@"Going to User Settings", language);
accountVC = [C6AccountSettingsViewController initWithDevice:device];
[_activeVC.view addSubview:accountVC.view];
}
}
最大的变化是我何时以及如何启动 _activeVC……以及 _languageVC 和 _accountVC 现在都是全局变量。
好吧，在此更改之后，NIB 按钮会调用两个 IBAction 方法:它是文件的所有者和协调 Controller 。
使用这种模式的另一件大事是如何在不爆炸 iOS 设备内存的情况下从一个 View 切换到另一个 View ……这是我在协调 Controller 中的做法:
- (IBAction) requestViewChangeByObject:(id)object {
int buttonTag = [object tag]; // dividend
int viewTag = buttonTag / divisor; // quotient
int actionTag = buttonTag - (divisor * viewTag); // remainder
C6Log(@"ViewTag: %d", viewTag);
switch (viewTag) {
case LanguageTags:{
C6Log(@"LanguageTags - button %d", actionTag);
accountVC = [C6AccountSettingsViewController initWithDevice:device];
UIView *fromView = languageVC.view;
UIView *toView = accountVC.view;
[self switchFrom:fromView To:toView usingAnimation:AnimationPushFromRigh];
}
break;
case AccountTags:{
C6Log(@"AccountTags - button %d", actionTag);
switch (actionTag) {
case 0:{
C6Log(@"Go back");
languageVC = [C6LanguageSettingsViewController initWithDevice:device];
UIView *fromView = accountVC.view;
UIView *toView = languageVC.view;
[self switchFrom:fromView To:toView usingAnimation:AnimationPushFromLeft];
}
break;
default:
break;
}
}
break;
default:
break;
}
}
在方法的开始，我做了很多数学......我“创建”了一个模式，其中每个 NIB 应该有它的标签以 100 倍数开头......所以，语言以 0 开头，帐户以 100 ......
#define divisor 100
#define LanguageTags 0
#define AccountTags 1
然后，我从一种 View 切换到另一种 View 的方式就在那里:
-(void) switchFrom:(UIView*) fromView To:(UIView*) toView usingAnimation:(int) animation{
C6Log(@"");
/*************** SET ALL DEFAULT TRANSITION SETTINGS ***************/
// Get the current view frame, width and height
CGRect pageFrame = fromView.frame;
CGFloat pageWidth = pageFrame.size.width;
// Create the animation
[UIView beginAnimations:nil context:nil];
// Create the delegate, so the "fromView" is removed after the transition
[UIView setAnimationDelegate: fromView];
[UIView setAnimationDidStopSelector:@selector(removeFromSuperview)];
// Set the transition duration
[UIView setAnimationDuration: 0.4];
// Add the "toView" as subview of "fromView" superview
[fromView.superview addSubview:toView];
switch (animation) {
case AnimationPushFromRigh:{
// Position the "toView" to the right corner of the page
toView.frame = CGRectOffset(pageFrame, pageWidth,0);
// Animate the "fromView" to the left corner of the page
fromView.frame = CGRectOffset(pageFrame, -pageWidth,0);
// Animate the "toView" to the center of the page
toView.frame = pageFrame;
// Animate the "fromView" alpha
fromView.alpha = 0;
// Set and animate the "toView" alpha
toView.alpha = 0;
toView.alpha = 1;
// Commit the animation
[UIView commitAnimations];
}
break;
case AnimationPushFromLeft:{
// Position the "toView" to the left corner of the page
toView.frame = CGRectOffset(pageFrame, -pageWidth,0);
// Animate the "fromView" to the right corner of the page
fromView.frame = CGRectOffset(pageFrame, pageWidth,0);
// Animate the "toView" to the center of the page
toView.frame = pageFrame;
// Animate the "fromView" alpha
fromView.alpha = 0;
// Set and animate the "toView" alpha
toView.alpha = 0;
toView.alpha = 1;
// Commit the animation
[UIView commitAnimations];
}
break;
default:
break;
}
}
我真的希望这对尝试使用这种协调 Controller 模式的人有所帮助:P
关于iphone - Cocoa Touch 中的协调 Controller 设计模式，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/10834826/