- (void)viewDidLoad
{
[super viewDidLoad];
}
-(id)init{
self = [super initWithNibName:@"WritingView" bundle:nil ];
if (self) {
//self.view.delegate = self;
self.txtMain.userInteractionEnabled = YES;
self.txtMain.delegate = self;
}
return self;
}
-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{
return [self init];
}
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView{
NSLog(@"textViewShouldBeginEditing:");
return YES;
}
self.txtMain是我在xib：WritingView中的根视图，并且我的视图控制器实现了协议UITextViewDelegate，如下所示：
@interface WritingViewController : UIViewController<UITextViewDelegate>
{
}
@property (strong, nonatomic) IBOutlet UITextView *txtMain;
我已经在textViewShouldBeginEditing或UITextViewDelegate中的其他函数中设置了断点，但是为什么没来？通过另一个ViewController创建此ViewController的方式，如下所示：
WritingViewController *aViewController = [[WritingViewController alloc] initWithNibName:@"WritingView" bundle:nil];
[self.view.superview addSubview:aViewController.view];
[self.view removeFromSuperview];
谁能告诉我为什么它不起作用，然后我更改了初始化代码：
-(id)init{
self = [super initWithNibName:@"WritingView" bundle:nil ];
if (self) {
UITextView *txtView = [[UITextView alloc] initWithFrame:self.view.frame];
txtView.textColor = [UIColor blackColor];
txtView.font = [UIFont fontWithName:@"Arial" size:18.0];
txtView.text = @"Now is the time for all good developers tocome to serve their country.\n\nNow is the time for all good developers to cometo serve their country.";//
self.txtMain = txtView;
self.txtMain.userInteractionEnabled = YES;
self.txtMain.delegate = self;
[self.view addSubview:txtView];
}
return self;
}
显然我使用了一个空白的View作为根视图，但是这一次，当我单击文本时，在main（）中编写了程序：
return UIApplicationMain(argc, argv, nil, NSStringFromClass([WheelDemoAppDelegate class]));
并在控制台中：
2013-11-03 22:53:57.514 Wheel demo[1718:a0b] *** -[WritingViewController respondsToSelector:]: message sent to deallocated instance 0x9b4eeb0
（lldb）
您需要以某种方式确保ARC系统没有从内存中删除您的对象。一旦它们的保留计数达到零，并且对象不再在范围内，ARC就会删除它们。ARC系统与垃圾收集器非常不同。您可能需要阅读以下内容：https : //developer.apple.com/library/mac/releasenotes/ObjectiveC/RN-TransitioningToARC/Introduction/Introduction.html
您收到的错误是未保留视图控制器（WritingViewController）的结果。尝试在创建viewcontroller的类上创建一个属性：
@property (nonatomic,strong) WritingViewController *writtingVc;
创建后，立即将其设置为您的WritingViewController实例。
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我来说两句