ios - 很难将 UIView 添加到 UIViewController 作为 subview

Question

我基本上想使用 Apple 的 MoveMe 示例中的 PlacardView.m 和 PlacardView.h，将其添加为我的主 BlowViewController 上的 subview

PlacardView.m

#import "PlacardView.h"

@implementation PlacardView

@synthesize placardImage;



- (id)init {
    // Retrieve the image for the view and determine its size
    UIImage *image = [UIImage imageNamed:@"Placard.png"];
    CGRect frame = CGRectMake(0, 0, image.size.width, image.size.height);

    // Set self's frame to encompass the image
    self = [self initWithFrame:frame];
    if (self) {
        self.opaque = NO;
        placardImage = image;
        }
    return self;
}


- (void)dealloc {
    [placardImage release];
    [super dealloc];
}





@end

PlacardView.h

@interface PlacardView : UIView {
    UIImage *placardImage;

}

@property (nonatomic, retain) UIImage *placardImage;

// Initializer for this object
- (id)init;

@end

这是我的 MicBlowViewController.h

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreAudio/CoreAudioTypes.h>

@class PlacardView;

@interface MicBlowViewController : UIViewController {
    AVAudioRecorder *recorder;
    NSTimer *levelTimer;
    double lowPassResults;

    PlacardView *placardView;
}


@property(nonatomic, retain) PlacardView *placardView;
- (void)setUpPlacardView;
- (void)levelTimerCallback:(NSTimer *)timer;

@end

这是部分 MicBlowViewController.m ..有一个函数 viewDidLoad 但它与 View 无关..它只是一个用于录音的计时器所以我没有粘贴它

#import "MicBlowViewController.h"
#import "PlacardView.h"

@implementation MicBlowViewController

    - (id)initWithFrame:(CGRect)frame {

        self = [super initWithFrame:frame];
        if (self) {
            [self setUpPlacardView];
        }
        return self;
    }


    - (void)setUpPlacardView {
        // Create the placard view -- its init method calculates its frame based on its image
        PlacardView *aPlacardView = [[PlacardView alloc] init];
        self.placardView = aPlacardView;
        [aPlacardView release];
        placardView.center = self.center;
        [self addSubview:placardView];
    }

我收到的错误是“在类型为“MicBlowViewController *”的对象上找不到属性‘center’”

请帮忙。

Answer 1

Ayush，您的代码让我有些困惑。

您的 Controller 代码似乎有几个问题。

UIViewController 没有 initWithFrame 方法，而是标准的 init 方法，如果使用接口(interface)，则有 initWithNibName:bundle: 方法生成器文件。

我看到您已经从 Apple 的 MoveMe 示例中复制并粘贴了代码，但是请记住，您从中将代码复制到 Controller 中的 MoveMeView 实际上是一个 UIView 而不是 UIViewController。

试试这个:

#import "MicBlowViewController.h"
#import "PlacardView.h"

@implementation MicBlowViewController

    - (void)viewDidLoad {

        [self setUpPlacardView];

        // Additonal code with your timer etc
    }


    - (void)setUpPlacardView {
        // Create the placard view -- its init method calculates its frame based on its image
        PlacardView *aPlacardView = [[PlacardView alloc] init];
        self.placardView = aPlacardView;
        [aPlacardView release];
        [self.view addSubview:placardView];
        self.placardView.center = self.view.center;
    }

您可能还需要实现 MicBlowViewController 的 loadView 方法。

您可能想查看 View Programming Guide ，以及 UIViewController class reference .