首先，我是 iOS 和 Objective-C 编程的新手（我是一个月前开始的）。
我正在尝试做一个自定义的tabBar，它在我的带有iOS 5.1.1 的iPhone 4 中运行良好，但它不适用于带有iOS 4.2.1 的3GS。我会更新它以查看它是否与 iOS 版本而不是手机型号相关，但我更喜欢在 iOS 4 中进行测试。
首先，如果有人帮助我找出导致此崩溃的原因以及如何避免它，我将非常高兴。好吧，正如调用堆栈中显示的那样，我的 viewController 似乎没有响应
transitionFromViewController:toViewController:duration:options:animations:completion:，但它在 iOS 5 中工作......难道它是 iOS 4 中不存在的新功能？如果这是刚刚发生的事情，我如何在没有这个选择器的情况下从一个 viewController 转换到另一个？其次，我想知道我的做法是否正确：正如我之前提到的，我想要的是我自己的自定义 TabBar。我所做的是制作一个具有 5 个按钮的 viewController，并且几乎整个屏幕都是一个带有插座的视图，可以根据按下的按钮在其中加载相应的 viewController。例如：
- 标题：
// CustomTabBarViewController.h
#import <UIKit/UIKit.h>
#import "Tab1ViewController.h"
@interface TabBarCustomViewController : UIViewController
// View Controllers
@property (retain, nonatomic) Tab1ViewController *myTab1ViewController;
@property (retain, nonatomic) Tab2ViewController *myTab2ViewController;
// Reference of the current shown viewController, for the transitions
@property (retain, nonatomic) UIViewController *currentViewController;
// Outlet to switch the viewController inside the view mainView;
@property (retain, nonatomic) IBOutlet UIView *mainView;
- .m 文件
#import "TabBarCustomViewController.h"
@interface TabBarCustomViewController ()
@end
@implementation TabBarCustomViewController
@synthesize myTab1ViewController, myTab2ViewController;
@synthesize currentViewController;
@synthesize mainView;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
//Instantiation of the viewControllers
self.myTab1ViewController = [[Tab1ViewController alloc]initWithNibName:@"Tab1ViewController" bundle:nil];
self.myTab2ViewController = [[Tab2ViewController alloc]initWithNibName:@"Tab2ViewController" bundle:nil];
// Adding those viewControllers to the root viewController
[self addChildViewController:self.myTab1ViewController];
[self addChildViewController:self.myTab2ViewController];
//the entry view
[mainView addSubview:self.myTab1ViewController.view];
currentViewController = self.myTab1ViewController;
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
// My methods
- (IBAction)tab1Pressed
{
NSLog(@"tab1Pressed");
[self transitionFromViewController:currentViewController toViewController:self.myTab1ViewController duration:0.2 options:UIViewAnimationOptionTransitionCrossDissolve animations:nil completion:nil];
// Updating the reference of which viewController is currently being displayed
currentViewController = myTab1ViewController;
}
- (IBAction)tab2Pressed
{
NSLog(@"tab2Pressed");
[self transitionFromViewController:currentViewController toViewController:self.myTab2ViewController duration:0.2 options:UIViewAnimationOptionTransitionCrossDissolve animations:nil completion:nil];
// Updating the reference of which viewController is currently being displayed
currentViewController = myTab2ViewController;
}
@end
- 这是发生第一点提到的崩溃时控制台中抛出的内容：
2012-06-08 08:25:55.991 myTabBar[4597:307] tab2Pressed
2012-06-08 08:25:56.003 myTabBar[4597:307] -[TabBarCustomViewController transitionFromViewController:toViewController:duration:options:animations:completion:]: unrecognized selector sent to instance 0x143cc0
2012-06-08 08:25:56.028 myTabBar[4597:307] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[TabBarCustomViewController transitionFromViewController:toViewController:duration:options:animations:completion:]: unrecognized selector sent to instance 0x143cc0'
*** Call stack at first throw:
(
0 CoreFoundation 0x314d0987 __exceptionPreprocess + 114
1 libobjc.A.dylib 0x319a149d objc_exception_throw + 24
2 CoreFoundation 0x314d2133 -[NSObject(NSObject) doesNotRecognizeSelector:] + 102
3 CoreFoundation 0x31479aa9 ___forwarding___ + 508
4 CoreFoundation 0x31479860 _CF_forwarding_prep_0 + 48
5 myTabBar 0x00003707 -[TabBarCustomViewController tab2Pressed] + 126
6 CoreFoundation 0x31477fed -[NSObject(NSObject) performSelector:withObject:withObject:] + 24
7 UIKit 0x338c14ad -[UIApplication sendAction:to:from:forEvent:] + 84
8 UIKit 0x338c144d -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 32
9 UIKit 0x338c141f -[UIControl sendAction:to:forEvent:] + 38
10 UIKit 0x338c1171 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 356
11 UIKit 0x338c19cf -[UIControl touchesEnded:withEvent:] + 342
12 UIKit 0x338b7355 -[UIWindow _sendTouchesForEvent:] + 368
13 UIKit 0x338b6ccf -[UIWindow sendEvent:] + 262
14 UIKit 0x338a1fc7 -[UIApplication sendEvent:] + 298
15 UIKit 0x338a1907 _UIApplicationHandleEvent + 5090
16 GraphicsServices 0x35d66f03 PurpleEventCallback + 666
17 CoreFoundation 0x314656ff __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 26
18 CoreFoundation 0x314656c3 __CFRunLoopDoSource1 + 166
19 CoreFoundation 0x31457f7d __CFRunLoopRun + 520
20 CoreFoundation 0x31457c87 CFRunLoopRunSpecific + 230
21 CoreFoundation 0x31457b8f CFRunLoopRunInMode + 58
22 GraphicsServices 0x35d664ab GSEventRunModal + 114
23 GraphicsServices 0x35d66557 GSEventRun + 62
24 UIKit 0x338d5329 -[UIApplication _run] + 412
25 UIKit 0x338d2e93 UIApplicationMain + 670
26 myTabBar 0x000027cb main + 102
27 myTabBar 0x00002760 start + 40
)
terminate called after throwing an instance of 'NSException'
(lldb)
我知道我可以使用[mainView addSubview:myTab1ViewController.view];
而不是[self transitionFromViewController:currentViewController toViewController:self.myTab2ViewController duration:0.2 options:UIViewAnimationOptionTransitionCrossDissolve animations:nil completion:nil];
但是这种方式我不能做过渡动画，除了我不确定这是否是做我想做的事情的正确方法。
先感谢您！