Xib调整使用
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：要想随意调整xib中view的尺寸，首先要设置size为Freeform
3.拖入图标图片、名字、下载按钮，调整设置，设置图片为本身尺寸Aspect Fit
4.代码修改为：
- (void)viewDidLoad
{
[super viewDidLoad]; //计算边距
CGFloat marginX=(self.view.bounds.size.width-kColCount * kAppViewW)/(kColCount + );
CGFloat marginY=; for (int i=; i<self.appList.count; i++) { UYAppInfo *appData=self.appList[i];
// 行
// 0, 1, 2 => 0
// 3, 4, 5 => 1
int row = i / kColCount; // 列
// 0, 3, 6 => 0
// 1, 4, 7 => 1
// 2, 5, 8 => 2
int col = i % kColCount; CGFloat x=marginX +col*(marginX+kAppViewW);
CGFloat y=kStartY+marginY+row*(marginY+kAppViewH); UIView *appView=[[[NSBundle mainBundle] loadNibNamed:@"UYAppView" owner:nil options:nil] lastObject];
//设置视图的位置
appView.frame=CGRectMake(x, y, kAppViewW, kAppViewH);
[self.view addSubview:appView]; // 1> UIImageView
UIImageView *icon = appView.subviews[]; //[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, kAppViewW, 50)];
// 设置图像
icon.image = [UIImage imageNamed:appData.icon]; // 2> UILabel -> 应用程序名称
UILabel *lable =appView.subviews[];
lable.text = appData.name; // 3> UIButton -> 下载按钮
UIButton *button = appView.subviews[];
// 给按钮添加监听方法
button.tag = i;
[button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
}
}
从上面，会看到，代码量已经少了很多了。
在代码中获取xib中的view的方法
方法一：
// 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
NSArray *viewArray = [[NSBundle mainBundle] loadNibNamed:@"UYAppView" owner:nil options:nil];
UIView *appView = [viewArray lastObject];
方法二（bundle参数可以为nil，默认就是main bundle）：
UINib *nib = [UINib nibWithNibName:@"app" bundle:[NSBundle mainBundle]];
NSArray *viewArray = [nib instantiateWithOwner:nil options:nil];
UIView *appView = [viewArray lastObject];
Xib和storyboard对比
共同点
- 都用来描述软件界面
- 都用Interface Builder工具来编辑
不同点
- Xib是轻量级的，用来描述局部的UI界面
- Storyboard是重量级的，用来描述整个软件的多个界面，并且能展示多个界面之间的跳转关系
使用代理重构
这部分的代码，为了MVC分开，相互之间不依赖，可以通过代理的方式。
模型
MJApp.h
#import <Foundation/Foundation.h> /**
copy : NSString
strong: 一般对象
weak: UI控件
assign:基本数据类型
*/ @interface MJApp : NSObject
/**
* 名称
*/
@property (nonatomic, copy) NSString *name;
/**
* 图标
*/
@property (nonatomic, copy) NSString *icon; /**
* 通过字典来初始化模型对象
*
* @param dict 字典对象
*
* @return 已经初始化完毕的模型对象
*/
- (instancetype)initWithDict:(NSDictionary *)dict; + (instancetype)appWithDict:(NSDictionary *)dict;
@end
MJApp.m
#import "MJApp.h" @implementation MJApp
- (instancetype)initWithDict:(NSDictionary *)dict
{
if (self = [super init]) {
self.name = dict[@"name"];
self.icon = dict[@"icon"];
}
return self;
} + (instancetype)appWithDict:(NSDictionary *)dict
{
return [[self alloc] initWithDict:dict];
}
@end
视图
MJAppView.h
#import <UIKit/UIKit.h> @class MJApp, MJAppView; // 声明一个协议
@protocol MJAppViewDelegate <NSObject>
@optional
- (void)appViewClickedDownloadButton:(MJAppView *)appView;
@end // 耦合性
@interface MJAppView : UIView /**
* 代理
*/
@property (nonatomic, weak) id<MJAppViewDelegate> delegate; //@property (weak, nonatomic) IBOutlet UIButton *downloadBtn; //@property (nonatomic, weak) UIView *vcView;
/**
* 模型数据
*/
@property (nonatomic, strong) MJApp *app; + (instancetype)appView; /**
* 通过模型数据来创建一个view
*/
+ (instancetype)appViewWithApp:(MJApp *)app; @end
MJAppView.m
#import "MJAppView.h"
#import "MJApp.h" @interface MJAppView()
@property (weak, nonatomic) IBOutlet UIImageView *iconView;
@property (weak, nonatomic) IBOutlet UILabel *nameLabel;
- (IBAction)download:(UIButton *)sender;
@end @implementation MJAppView + (instancetype)appViewWithApp:(MJApp *)app
{
NSBundle *bundle = [NSBundle mainBundle];
// 读取xib文件(会创建xib中的描述的所有对象,并且按顺序放到数组中返回)
NSArray *objs = [bundle loadNibNamed:@"MJAppView" owner:nil options:nil];
MJAppView *appView = [objs lastObject];
appView.app = app;
return appView;
} + (instancetype)appView
{
return [self appViewWithApp:nil];
} - (void)setApp:(MJApp *)app
{
_app = app; // 1.设置图标
self.iconView.image = [UIImage imageNamed:app.icon]; // 2.设置名称
self.nameLabel.text = app.name;
} /**
* 下载
*/
- (IBAction)download:(UIButton *)btn {
// 1.让按钮失效(文字变为"已下载")
btn.enabled = NO; // 2.通知代理
// [self.delegate appViewClickedDownloadButton:self];
if ([self.delegate respondsToSelector:@selector(appViewClickedDownloadButton:)]) {
[self.delegate appViewClickedDownloadButton:self];
}
}
@end
控制器
MJViewController.h
#import <UIKit/UIKit.h> @interface MJViewController : UIViewController @end
MJViewController.m
#import "MJViewController.h"
#import "MJApp.h"
#import "MJAppView.h" @interface MJViewController () <MJAppViewDelegate>
/** 存放应用信息 */
@property (nonatomic, strong) NSArray *apps;
@end @implementation MJViewController - (void)viewDidLoad
{
[super viewDidLoad]; // 添加应用信息 // 0.总列数(一行最多3列)
int totalColumns = ; // 1.应用的尺寸
CGFloat appW = ;
CGFloat appH = ; // 2.间隙 = (控制器view的宽度 - 3 * 应用宽度) / 4
CGFloat marginX = (self.view.frame.size.width - totalColumns * appW) / (totalColumns + );
CGFloat marginY = ; // 3.根据应用个数创建对应的框框(index 0 ~ 11)
for (int index = ; index<self.apps.count; index++) {
// 3.1.创建view
MJAppView *appView = [MJAppView appViewWithApp:self.apps[index]]; appView.delegate = self; // appView.downloadBtn.tag = index;
// [appView.downloadBtn addTarget:self action:@selector(download:) forControlEvents:UIControlEventTouchUpInside];
// appView.vcView = self.view; // 3.2.添加view
[self.view addSubview:appView]; // 3.3.设置frame
int row = index / totalColumns;
int col = index % totalColumns;
// 计算x和y
CGFloat appX = marginX + col * (appW + marginX);
CGFloat appY = + row * (appH + marginY);
appView.frame = CGRectMake(appX, appY, appW, appH); // 3.4.设置数据
// appView.app = self.apps[index];
}
} /**
* 当点击下载按钮时就会调用
*/
- (void)appViewClickedDownloadButton:(MJAppView *)appView
{
// 1.取出模型
MJApp *app = appView.app; // 2.添加标签
UILabel *label = [[UILabel alloc] init];
label.text = [NSString stringWithFormat:@"成功下载%@", app.name];
label.font = [UIFont systemFontOfSize:];
label.textAlignment = NSTextAlignmentCenter;
label.textColor = [UIColor whiteColor];
label.backgroundColor = [UIColor blackColor];
label.frame = CGRectMake(, , , );
label.center = CGPointMake(, );
label.alpha = 0.0;
label.layer.cornerRadius = ;
label.clipsToBounds = YES;
[self.view addSubview:label]; // 3.动画
[UIView animateWithDuration:1.0 animations:^{
label.alpha = 0.5;
} completion:^(BOOL finished) {
[UIView animateWithDuration:1.0 delay:1.0 options:UIViewAnimationOptionCurveLinear animations:^{
label.alpha = 0.0;
} completion:^(BOOL finished) {
[label removeFromSuperview];
}];
}];
} - (NSArray *)apps
{
if (_apps == nil) {
// 初始化 // 1.获得plist的全路径
NSString *path = [[NSBundle mainBundle] pathForResource:@"app.plist" ofType:nil]; // 2.加载数组
NSArray *dictArray = [NSArray arrayWithContentsOfFile:path]; // 3.将dictArray里面的所有字典转成模型对象,放到新的数组中
NSMutableArray *appArray = [NSMutableArray array];
for (NSDictionary *dict in dictArray) {
// 3.1.创建模型对象
MJApp *app = [MJApp appWithDict:dict]; // 3.2.添加模型对象到数组中
[appArray addObject:app];
} // 4.赋值
_apps = appArray;
}
return _apps;
} @end