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实例1-照片墙

实例1-照片墙

作者: yz_wang | 来源:发表于2016-12-02 21:13 被阅读0次

    1. 需要实现的功能

    照片小图排列显示，点击任意一张图片可以切换成大图。
    实现思路：根视图中显示小图，用滚动视图控制器来显示全部图片；另一个视图控制器来显示大图，用一个导航控制器来管理这两个视图的前进后退关系。

    2. 实现小图排列显示

    首先还是删除ViewController文件，在AppDelegate.m中添加代码，创建window和导航控制器：

    p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #008400}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; min-height: 13.0px}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'Heiti SC Light'; color: #008400}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #3d1d81}p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}p.p7 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #bb2ca2}span.s1 {font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s3 {font-variant-ligatures: no-common-ligatures; color: #703daa}span.s4 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s5 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures; color: #000000}span.s6 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s7 {font-variant-ligatures: no-common-ligatures; color: #4f8187}span.s8 {font-variant-ligatures: no-common-ligatures; color: #3d1d81}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    //导航控制器框架结构
    self.window=[[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
    UINavigationController* nav=[[UINavigationController alloc]initWithRootViewController:[[VCRoot alloc]init]];
    
    self.window.rootViewController=nav;
    [self.window makeKeyAndVisible];
    
    
    
    return YES;
}

    </br>
    之后创建一个新文件VCRoot，在VCRoot.m中设置导航控制器属性，创建滚动视图，打开并设置点击手势交互事件：

    p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #3d1d81}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #008400}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; min-height: 13.0px}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'Heiti SC Light'; color: #008400}span.s1 {font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s3 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s4 {font-variant-ligatures: no-common-ligatures; color: #703daa}span.s5 {font-variant-ligatures: no-common-ligatures; color: #d12f1b}span.s6 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures; color: #d12f1b}span.s7 {font-variant-ligatures: no-common-ligatures; color: #3d1d81}span.s8 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures}span.s9 {font-variant-ligatures: no-common-ligatures; color: #272ad8}span.s10 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures; color: #000000}span.s11 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s12 {font-variant-ligatures: no-common-ligatures; color: #008400}span.s13 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures; color: #008400}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    
    self.title=@"照片墙";
    self.navigationController.navigationBar.translucent=NO;
    self.navigationController.navigationBar.barTintColor=[UIColor yellowColor];
    
    
    
    //滚动视图
    UIScrollView* sv=[[UIScrollView alloc]init];
    sv.frame=CGRectMake(5, 10, 300, 400);
    //画布大小
    sv.contentSize=CGSizeMake(300, 480*1.5);
    //隐藏右侧滚动条
    sv.showsVerticalScrollIndicator=NO;
    
    
    //打开交互事件
    sv.userInteractionEnabled=YES;
    self.view.backgroundColor=[UIColor whiteColor];
    
    for (int i=0; i<15; i++) {
        NSString* strName=[NSString stringWithFormat:@"%d.jpg",i+1];
        UIImage* image=[UIImage imageNamed:strName];
        UIImageView* iView=[[UIImageView alloc]initWithImage:image];
        iView.frame=CGRectMake(3+(i%3)*100, 10+(i/3)*150, 90, 130);
        [sv addSubview:iView];
        
        
        //加手势
        iView.userInteractionEnabled=YES;
        UITapGestureRecognizer* tap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(pressTap:)];
        
        //单次单击
        tap.numberOfTapsRequired=1;
        //单个手指
        tap.numberOfTouchesRequired=1;
        [iView addGestureRecognizer:tap];
    }
    [self.view addSubview:sv];
    
}

    其中创建每个图片视图并设置他们的的位置用到了for循环，这里比较巧妙用取余和除法两个运算得到图片的行列数，然后错位以显示图片。

    得到的效果如下：

    屏幕快照 2016-12-02 下午8.42.31.png

    3. 实现视图切换

    为了创建一个用于显示大图片的视图，我们再新建一个视图控制器类型的文件VCImageShow。
    我们用三种方法来实现这个功能，分别是传递图像标签，传递图片和传递图像视图。
    首先在VCImageShow.h中声明这三种方法要用到的变量：

    p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #d12f1b}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; min-height: 13.0px}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'Heiti SC Light'; color: #008400}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #bb2ca2}span.s1 {font-variant-ligatures: no-common-ligatures; color: #78492a}span.s2 {font-variant-ligatures: no-common-ligatures}span.s3 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s4 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s5 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s6 {font-variant-ligatures: no-common-ligatures; color: #703daa}

#import <UIKit/UIKit.h>

@interface VCImageShow : UIViewController

//分别用以下三种方法将点击的视图传递下去
@property(nonatomic,assign)NSUInteger imgTag;
@property(nonatomic,retain)UIImage* image;
@property(nonatomic,retain)UIImageView* imgView;

@end
    • 第一种方法：传递图像视图
      在VCImageShow.m中：
    p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #3d1d81}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #008400}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; min-height: 13.0px}span.s1 {font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s3 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s4 {font-variant-ligatures: no-common-ligatures; color: #3d1d81}span.s5 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures}span.s6 {font-variant-ligatures: no-common-ligatures; color: #703daa}span.s7 {font-variant-ligatures: no-common-ligatures; color: #d12f1b}span.s8 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures; color: #d12f1b}span.s9 {font-variant-ligatures: no-common-ligatures; color: #4f8187}span.s10 {font-variant-ligatures: no-common-ligatures; color: #272ad8}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor=[UIColor yellowColor];
    
    //传imgView：
    self.title=@"图片展示";
    _imgView.frame=CGRectMake(0, 0, 320, 480);
    [self.view addSubview:_imgView];
}

    在VCRoot.m中实现触发函数：

    p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'Heiti SC Light'; color: #008400}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #3d1d81}span.s1 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s2 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s3 {font-variant-ligatures: no-common-ligatures}span.s4 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures; color: #000000}span.s5 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s6 {font-variant-ligatures: no-common-ligatures; color: #4f8187}span.s7 {font-variant-ligatures: no-common-ligatures; color: #3d1d81}span.s8 {font-variant-ligatures: no-common-ligatures; color: #703daa}

-(void)pressTap:(UITapGestureRecognizer*) tap
{
    UIImageView* imageView=(UIImageView*)tap.view;
    //创建显示视图控制器
    VCImageShow* imageShow=[[VCImageShow alloc]init];
    //将点击的图像赋值
    imageShow.imgView=imageView;
    //将显示视图控制器推出
    [self.navigationController pushViewController:imageShow animated:YES];
}

    特点：代码最简单，但是有bug，就是点过的图片退回来之后就不能在小图中显示了，如图：

    屏幕快照 2016-12-02 下午8.51.56.png

    原因：一个视图对象只能有一个根视图，当我们把视图添加到新的父亲视图上时，就会从原来的父亲视图中删除。所以当我们赋给ImageShow视图了，这个图片视图就不在滚动视图上了。
    所以传递视图的方法是不可行的。

    • 第二种方法：传递图片
      在VCRoot.m中实现触发函数，传递图片：
    p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'Heiti SC Light'; color: #008400}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #3d1d81}span.s1 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s2 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s3 {font-variant-ligatures: no-common-ligatures}span.s4 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures; color: #000000}span.s5 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s6 {font-variant-ligatures: no-common-ligatures; color: #4f8187}span.s7 {font-variant-ligatures: no-common-ligatures; color: #3d1d81}span.s8 {font-variant-ligatures: no-common-ligatures; color: #703daa}

-(void)pressTap:(UITapGestureRecognizer*) tap
{
    UIImageView* imageView=(UIImageView*)tap.view;
    //创建显示视图控制器
    VCImageShow* imageShow=[[VCImageShow alloc]init];
    //将点击的图像赋值
    imageShow.image=imageView.image;
    //将显示视图控制器推出
    [self.navigationController pushViewController:imageShow animated:YES];
}

    之后要去VCImageShow.m中创建image并赋值：

    p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #3d1d81}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #008400}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; min-height: 13.0px}p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #4f8187}span.s1 {font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s3 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s4 {font-variant-ligatures: no-common-ligatures; color: #3d1d81}span.s5 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures}span.s6 {font-variant-ligatures: no-common-ligatures; color: #703daa}span.s7 {font-variant-ligatures: no-common-ligatures; color: #d12f1b}span.s8 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures; color: #d12f1b}span.s9 {font-variant-ligatures: no-common-ligatures; color: #4f8187}span.s10 {font-variant-ligatures: no-common-ligatures; color: #272ad8}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor=[UIColor yellowColor];
    
    //传imgView：
    self.title=@"图片展示";
    _imgView=[[UIImageView alloc]init];
    _imgView.frame=CGRectMake(0, 0, 320, 480);
    _imgView.image=_image;
    [self.view addSubview:_imgView];
}

    即可实现效果：

    屏幕快照 2016-12-02 下午9.03.50.png
    • 第三种方法：传递图片tag
      在VCRoot的viewDidLoad里加一句tag：
    p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'Heiti SC Light'; color: #008400}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}span.s1 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures}span.s3 {font-variant-ligatures: no-common-ligatures; color: #703daa}span.s4 {font-variant-ligatures: no-common-ligatures; color: #272ad8}

//图像对象的tag值
        iView.tag=101+i;

    然后实现触发函数：

    p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'Heiti SC Light'; color: #008400}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #3d1d81}span.s1 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s2 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s3 {font-variant-ligatures: no-common-ligatures}span.s4 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures; color: #000000}span.s5 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s6 {font-variant-ligatures: no-common-ligatures; color: #4f8187}span.s7 {font-variant-ligatures: no-common-ligatures; color: #3d1d81}span.s8 {font-variant-ligatures: no-common-ligatures; color: #703daa}

-(void)pressTap:(UITapGestureRecognizer*) tap
{
    UIImageView* imageView=(UIImageView*)tap.view;
    //创建显示视图控制器
    VCImageShow* imageShow=[[VCImageShow alloc]init];
    imageShow.imgTag=imageView.tag;
    [self.navigationController pushViewController:imageShow animated:YES];
}

    在VCImageShow中利用传进来的tag值选取照片赋给显示视图：

    p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #3d1d81}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #008400}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; min-height: 13.0px}p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #4f8187}span.s1 {font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s3 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s4 {font-variant-ligatures: no-common-ligatures; color: #3d1d81}span.s5 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures}span.s6 {font-variant-ligatures: no-common-ligatures; color: #703daa}span.s7 {font-variant-ligatures: no-common-ligatures; color: #d12f1b}span.s8 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures; color: #d12f1b}span.s9 {font-variant-ligatures: no-common-ligatures; color: #4f8187}span.s10 {font-variant-ligatures: no-common-ligatures; color: #272ad8}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor=[UIColor yellowColor];
    
    //传imgView：
    self.title=@"图片展示";
    _imgView=[[UIImageView alloc]init];
    _imgView.frame=CGRectMake(0, 0, 320, 480);
    _imgView.image=_image;
    
    _imgView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%lu.jpg",_imgTag-100]];
    
    [self.view addSubview:_imgView];
}

    即可。

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