iphone - 如何显示在界面生成器中创建的自定义 uialertview

Question

我在 ib 中创建了一个自定义 uialertview，带有两个按钮和一个文本字段。然后我以这种方式创建一个 .h 和一个 .m:

#import <UIKit/UIKit.h>

@interface DialogWelcome : UIAlertView{
    IBOutlet UITextField *text;
    UIButton *ok;
    UIButton *annulla;
}
@property(nonatomic,retain) UITextField *text;
- (IBAction)ok:(id)sender;
- (IBAction)annulla:(id)sender;
@end

和.m:

#import "DialogWelcome.h"

@implementation DialogWelcome
@synthesize text;

-(IBAction)ok:(id)sender{

}
-(IBAction)annulla:(id)sender{

}

@end

我还没有实现方法，因为首先我需要展示它!我在 View Controller 中这样调用它:

- (void)viewDidLoad
{
    [super viewDidLoad];
    DialogWelcome *alert = [[DialogWelcome alloc] initWithTitle:@"Welcome" 
                                                message:nil 
                                               delegate:nil 
                                      cancelButtonTitle:nil 
                                      otherButtonTitles:nil];

    [alert show];
    dispatch_time_t delay = dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC*2.0);
    dispatch_after(delay, dispatch_get_main_queue(), ^{
        [alert dismissWithClickedButtonIndex:0 animated:YES];
    });

    [alert release];
}

这将显示一个带有标题的空普通 uialertview。为什么它不显示我的自定义 uialertview？

Answer 1

来自UIAlertView Class Reference :

The UIAlertView class is intended to be used as-is and does not support subclassing. The view hierarchy for this class is private and must not be modified.

因此，您尝试执行的操作是明确不允许的。