首页 > 代码库 > [iOS基础控件 - 4.3] xib的使用
[iOS基础控件 - 4.3] xib的使用
A.storyboard和xib
1.storyboard: 相对xib较重量级,控制整个应用的所有界面
2.xib: 轻量级,一般用来描述局部界面
B.使用
1.新建xib文件
New File ==> User Interface ==> Empty
2.打开新建的xib文件,出现可视化窗口
(1)拖入一个UIView (不是UIViewController)
(2)设置大小:开启可自定义尺寸 ==> 定义尺寸
(3)拖入图标图片、名字、下载按钮,调整设置
3.在代码中获取xib中的view,并设置数据
(1)从xib获取view
a.方法1:
1 // 1.获取xib中的view, xib中可以同时定义多个view,注意名字不带扩展名2 NSArray *viewArray = [[NSBundle mainBundle] loadNibNamed:@"app" owner:nil options:nil];3 UIView *appView = [viewArray lastObject];
b.方法2:
1 UINib *nib = [UINib nibWithNibName:@"app" bundle:[NSBundle mainBundle]];2 NSArray *viewArray = [nib instantiateWithOwner:nil options:nil];3 UIView *appView = [viewArray lastObject];
(2)取出View中的元素,设置图片
a.方法1,使用SubView数组:
1 // 3.设置图片2 UIImageView *iconView = appView.subviews[2];3 iconView.image = [UIImage imageNamed:appData.icon];
注意:按照教程是按照下图的顺序排列数组元素(imageView应该是subviews[0],但是实际编程发现却不是,所以此方法并不稳定)
b.方法2,使用tag:
1 // 3.设置图片2 UIImageView *iconView = [appView viewWithTag:1];3 iconView.image = [UIImage imageNamed:appData.icon];
(3)设置名字
1 // 4.设置名字2 UILabel *nameLabel = [appView viewWithTag:2];3 nameLabel.text = appData.name;
(4)下载按钮已经在xib中定义好,不必使用代码
C.实现代码
1 #import "ViewController.h" 2 #import "App.h" 3 4 #define ICON_KEY @"icon" 5 #define NAME_KEY @"name" 6 #define APP_WIDTH 85 7 #define APP_HEIGHT 90 8 #define MARGIN_HEAD 20 9 #define ICON_WIDTH 50 10 #define ICON_HEIGHT 50 11 #define NAME_WIDTH APP_WIDTH 12 #define NAME_HEIGHT 20 13 #define DOWNLOAD_WIDTH (APP_WIDTH - 20) 14 #define DOWNLOAD_HEIGHT 20 15 16 @interface ViewController () 17 18 /** 存放应用信息 */ 19 @property(nonatomic, strong) NSArray *apps; // 应用列表 20 21 @end 22 23 @implementation ViewController 24 25 - (void)viewDidLoad { 26 [super viewDidLoad]; 27 // Do any additional setup after loading the view, typically from a nib. 28 29 [self loadApps]; 30 } 31 32 - (void)didReceiveMemoryWarning { 33 [super didReceiveMemoryWarning]; 34 // Dispose of any resources that can be recreated. 35 } 36 37 #pragma mark 取得应用列表 38 - (NSArray *) apps { 39 if (nil == _apps) { 40 // 1.获得plist的全路径 41 NSString *path = [[NSBundle mainBundle] pathForResource:@"app.plist" ofType:nil]; 42 43 // 2.加载数据 44 NSArray *dictArray = [NSArray arrayWithContentsOfFile:path]; 45 46 // 3.将dictArray里面的所有字典转成模型,放到新数组中 47 NSMutableArray *appArray = [NSMutableArray array]; 48 for (NSDictionary *dict in dictArray) { 49 // 3.1创建模型对象 50 App *app = [App appWithDictionary:dict]; 51 52 // 3.2 添加到app数组中 53 [appArray addObject:app]; 54 } 55 56 _apps = appArray; 57 } 58 59 return _apps; 60 } 61 62 #pragma mark 加载全部应用列表 63 - (void) loadApps { 64 int appColumnCount = [self appColumnCount]; 65 int appRowCount = [self appRowCount]; 66 67 CGFloat marginX = (self.view.frame.size.width - APP_WIDTH * appColumnCount) / (appColumnCount + 1); 68 CGFloat marginY = (self.view.frame.size.height - APP_HEIGHT * appRowCount) / (appRowCount + 1) + MARGIN_HEAD; 69 70 int column = 0; 71 int row = 0; 72 for (int index=0; index<self.apps.count; index++) { 73 App *appData =http://www.mamicode.com/ self.apps[index]; 74 75 // 1.获取xib中的view, xib中可以同时定义多个view,注意名字不带扩展名 76 // NSArray *viewArray = [[NSBundle mainBundle] loadNibNamed:@"app" owner:nil options:nil]; 77 // UIView *appView = [viewArray lastObject]; 78 79 UINib *nib = [UINib nibWithNibName:@"app" bundle:[NSBundle mainBundle]]; 80 NSArray *viewArray = [nib instantiateWithOwner:nil options:nil]; 81 UIView *appView = [viewArray lastObject]; 82 83 // 2.定义每个app的位置、尺寸 84 CGFloat appX = marginX + column * (marginX + APP_WIDTH); 85 CGFloat appY = marginY + row * (marginY + APP_HEIGHT); 86 appView.frame = CGRectMake(appX, appY, APP_WIDTH, APP_HEIGHT); 87 88 // 3.设置图片 89 UIImageView *iconView = [appView viewWithTag:1]; 90 iconView.image = [UIImage imageNamed:appData.icon]; 91 92 // 4.设置名字 93 UILabel *nameLabel = [appView viewWithTag:2]; 94 nameLabel.text = appData.name; 95 96 // 5.加入此app信息到总view 97 [self.view addSubview:appView]; 98 99 column++;100 if (column == appColumnCount) {101 column = 0;102 row++;103 }104 }105 }106 107 108 #pragma mark 计算列数109 - (int) appColumnCount {110 int count = 0;111 count = self.view.frame.size.width / APP_WIDTH;112 113 if ((int)self.view.frame.size.width % (int)APP_WIDTH == 0) {114 count--;115 }116 117 return count;118 }119 120 #pragma mark 计算行数121 - (int) appRowCount {122 int count = 0;123 count = (self.view.frame.size.height - MARGIN_HEAD) / APP_HEIGHT;124 125 if ((int)(self.view.frame.size.height - MARGIN_HEAD) % (int)APP_HEIGHT == 0) {126 count--;127 }128 129 return count;130 }131 132 @end
[iOS基础控件 - 4.3] xib的使用
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。