为UIView创建子类以实现可重用性

我有一个DiscoverViewController.h和.m文件，它们有一个函数，可以替换要发现的位置的视图。我也想在输出视图控制器中重用此视图。具有的DicoverViewController.m的代码如下：

for (PFObject *views in objects)
{
  // Get the discoverr view setup
  CGRect frame = CGRectMake(5.0, _viewStart, 310.0, viewHeight);

  DiscoverView *parent = [[DiscoverView alloc] init];

  [parent buildDiscoverViewWithFrame:frame andObjects:replies];
  // UIView *parent = [[UIView alloc] initWithFrame:CGRectMake(5.0, _viewStart, 310.0, viewHeight)];
  parent.backgroundColor = [UIColor whiteColor];
  // parent.layer.cornerRadius = 2.0;
  parent.layer.borderColor = [UIColor regularColor].CGColor;
  parent.layer.borderWidth = 1.0f;
  parent.tag = 1000 + _step;

  // Add the label counter
  // Add discover id for testing (is unique id)
  UILabel *placeholder = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 10.0, 310.0, 12.0)];
  placeholder.backgroundColor = [UIColor clearColor];
  placeholder.textAlignment =  NSTextAlignmentCenter;
  placeholder.textColor = [UIColor bestTextColor];
  placeholder.font = [UIFont fontWithName:@"HelveticaNeue-Light" size:(12.0)];
  placeholder.Text = [NSString stringWithFormat:@"%@", views.objectId];

  [parent addSubview:placeholder];

  // Increase size of content view
  CGRect newContentView = _contentView.frame;

  newContentView.size.width = _contentView.frame.size.width;
  newContentView.size.height = _contentView.frame.size.height + bestHeight;

  [_contentView setFrame:newContentView];

  [_contentView addSubview:parent];

  scrollView.contentSize = _contentView.frame.size;

  // Adjust the postions
  _viewStart = _viewStart + viewHeight - 1.0;
  _step = _step + 1;
}                 

这个类名为DiscoverView.h

#import <UIKit/UIKit.h>
#import <Parse/Parse.h>

@interface DiscoverView : UIView

- (UIView *) buildDiscoverViewWithFrame:(CGRect) frame andObjects:(PFObject *) objects;

@end

不知何故，这是不正确的工作。框架不会显示在正确的空间中，水龙头根本不工作。我是否需要将其更改为类引用与实例？如何重用此类（DiscoveryView）并使其正常工作

---

谢谢。

你的想法很好，我认为你走对了。。。你刚才犯了一些错误：

- (UIView *)buildDiscoverViewWithFrame:(CGRect) frame andObjects:(PFObject *) objects
{
    //Your method name is buildDiscoverView, but you are making a view
    //that is not a DiscoverView class. 
    UIView *discover = [[UIView alloc] initWithFrame:frame];

    //Tap gesture stuff...

    return discover;
}

以及：

我很确定这不是你真正想要的。我认为您正在尝试构建一个DiscoveryView实例，对吗？您可以这样做：

关于您的发现视图.m

- (id)initWithFrame:(CGRect)frame andObjects:(PFObject *)objects {

    //You can call initWithFrame: method here as our base constructor
    self = [super initWithFrame:frame];

    if (self) {

        //Add tap gesture here
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(discoverTapPressed)];
        [self addGestureRecognizer:tap];

        //and maybe do some other stuff as changing the background color
        //or making the border stuff that you are doing outside...
    }

    return self;
}

DiscoverView *parent = [[DiscoverView alloc] initWithFrame:frame andObjects:replies];

//If you do this on init, you don't need this anymore...
//parent.backgroundColor = [UIColor whiteColor];
//parent.layer.cornerRadius = 2.0;
//parent.layer.borderColor = [UIColor regularColor].CGColor;
//parent.layer.borderWidth = 1.0f;

现在，您可以按如下方式初始化实例：

在您的DiscoveryViewController.m上

- (id)initWithFrame:(CGRect)frame andObjects:(PFObject *)objects {

    //You can call initWithFrame: method here as our base constructor
    self = [super initWithFrame:frame];

    if (self) {

        //Add tap gesture here
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(discoverTapPressed)];
        [self addGestureRecognizer:tap];

        //and maybe do some other stuff as changing the background color
        //or making the border stuff that you are doing outside...
    }

    return self;
}

DiscoverView *parent = [[DiscoverView alloc] initWithFrame:frame andObjects:replies];

//If you do this on init, you don't need this anymore...
//parent.backgroundColor = [UIColor whiteColor];
//parent.layer.cornerRadius = 2.0;
//parent.layer.borderColor = [UIColor regularColor].CGColor;
//parent.layer.borderWidth = 1.0f;

仅供参考：我还建议您检查新的

IBDesignable

功能，它允许我们直接从故事板可视化结果（但这不是您在本线程中要求的）

更新：

---

正如@abhishekkharwar所说，有许多其他方法可以更好地做到这一点，比如使用

UICollectionView

或

UITableView

，但您必须决定哪些方法更适合您的应用程序需求。不要重新发明轮子。

将名为DiscoverView.h的UIView类更改为

- (id)initWithFrame:(CGRect)frame andObjects:(PFObject *)objects;

将实现文件DiscoverView.m更改为：

@interface DiscoverView ()
@property (nonatomic, strong) id photoObject;
@end
@implementation DiscoverView

- (id)initWithFrame:(CGRect)frame andObjects:(PFObject *)objects {

    //You can call initWithFrame: method here as our base constructor
    self = [super initWithFrame:frame];

    if (self) {

        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(discoverTapPressed)];
        [self addGestureRecognizer:tap];
        _photoObject = objects.objectId;
        self.backgroundColor = [UIColor whiteColor];
        self.layer.cornerRadius = 2.0;
        self.layer.borderColor = [UIColor redColor].CGColor;
        self.layer.borderWidth = 1.0f;
    }

    return self;
}

- (void) discoverTapPressed
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"The id is:"
                                                    message:_photoObject
                                                   delegate:nil
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
    [alert show];
}

替换旧代码中的代码：

   DiscoverView *parent = [[DiscoverView alloc] init];
  [parent buildDiscoverViewWithFrame:frame andObjects:replies];
  // UIView *parent = [[UIView alloc] initWithFrame:CGRectMake(5.0, _viewStart, 310.0, viewHeight)];
  parent.backgroundColor = [UIColor whiteColor];
  // parent.layer.cornerRadius = 2.0;
  parent.layer.borderColor = [UIColor regularColor].CGColor;
  parent.layer.borderWidth = 1.0f;
  parent.tag = 1000 + _step;

到

---

为什么不使用UITableView或UICollectionView？创建manual infinite scrollview背后有什么具体原因吗？请参阅下面我的评论（几乎90%的工作都是由表视图完成的，但我希望我的应用程序的最后10%的UI很难实现）。但我确实在其他地方使用表视图和集合视图，而整个页面本身就是一个集合或表视图。你能发布UI的屏幕截图吗？是的，我在应用程序中有集合视图和表视图。正是因为这些ceratin页面/控制器，页面上有更多不同的UI类型，使得这些视图“不太适合”。但我确实在其他地方使用了它们（tableview让我在那里得到了90%，但最后10%证明使用tableview很难实现）。我同意不重新创造遗嘱是件好事。@chris>好的，所以只要按照我上面写的方式修改代码就可以了，而且要开心。。。我相信这会解决你的问题。

    DiscoverView *parent = [[DiscoverView alloc] initWithFrame:frame andObjects:replies];
    parent.tag = 1000 + _step;