ios开发-UI基础-应用管理(单纯界面)改进5-使用代理实现监听下载按钮的点击(delegate)

　　　[注意]转载时请注明出处博客园-吃唐僧肉的小悟空http://www.cnblogs.com/hukezhu/　

　　前几篇文章介绍了一个应用管理的小应用,从最开始的单纯实现功能,一步一步就行改进封装,上篇文章是使用xib进行了优化,本篇文章使用代理实现监听下载按钮的点击.

　　在原来的基础上,使用代理的主要思路分析:

• • 首先要新建一个协议
  • 声明协议的要实现的方法(一般为optional)
  • 声明一个遵守该协议的代理的属性
  • 使用代理,通知其代理完成操作

　　在代理中的实现步骤:

• • 遵守协议
  • 设置代理(一般通过拖线也可以实现)
  • 实现代理中需要实现的方法

附上应用代码结构及xib截图:

附上源代码:

　　AppView.h

//
//  AppView.h
//  UI基础-03-05-14
//
//  Created by hukezhu on 15/5/15.
//
//

#import <UIKit/UIKit.h>
@class KZAppModel;
@class AppView;



@protocol AppViewProtocol <NSObject>

- (void)appViewDownload:(AppView *)appView;

@end





@interface AppView : UIView

//声明一个模型属性,用来接收传过来的模型数据
@property (nonatomic,strong)KZAppModel *appViewModel;


//声明一个代理的属性
@property(nonatomic,assign) id<AppViewProtocol> delegate;

//用来加载xib
+(instancetype)loadNib;
@end

  　　AppView.m

//
//  AppView.m
//  UI基础-03-05-14
//
//  Created by hukezhu on 15/5/15.
//
//[注意]转载时请注明出处博客园-吃唐僧肉的小悟空http://www.cnblogs.com/hukezhu/

#import "AppView.h"
#import "KZAppModel.h"
@interface AppView ()
@property (nonatomic,weak)IBOutlet UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UILabel *label;

-(IBAction)btnOnClick:(UIButton *)btn;
@end


@implementation AppView
//重写模型的set方法
-(void)setAppViewModel:(KZAppModel *)appViewModel{

    _appViewModel = appViewModel;
    self.imageView.image = [UIImage imageNamed:appViewModel.icon];
    self.label.text = appViewModel.name;
}


+(instancetype)loadNib{

    return [[NSBundle mainBundle]loadNibNamed:@"AppView" owner:nil options:nil][0];
}


/*吃唐僧肉的小悟空-转载请注明出处http://www.cnblogs.com/hukezhu/*/
/**
 *  按钮的点击方法
 *
 *  @param btn 将按钮本身传入方法中,哪个按钮被点击就调用这个方法
 */
- (void)btnOnClick:(UIButton *)btn{
    
    //NSLog(@"------%@",btn);
    btn.enabled = NO;
    [btn setTitle:@"已下载" forState:UIControlStateNormal];

    if ([self.delegate respondsToSelector:@selector(appViewDownload:)]) {
        [self.delegate appViewDownload:self];
    }
    
    
}

@end

      KZAppModel.h

//
//  KZAppModel.h
//  UI基础-03-05-14
//
//  Created by hukezhu on 15/5/15.
//
//

#import <Foundation/Foundation.h>
/*吃唐僧肉的小悟空-转载请注明出处http://www.cnblogs.com/hukezhu/*/
@interface KZAppModel : NSObject
/**
 *  应用图标
 */
@property (nonatomic ,copy) NSString *icon;
/**
 *  应用名称
 */
@property (nonatomic ,copy) NSString *name;

/**
 *  通过字典来初始化对象
 *
 *  @param dict 字典对象
 *
 *  @return 已经初始化完毕的模型对象
 */
- (instancetype)initWithDict:(NSDictionary *)dict;

//类方法
+ (instancetype)appWithModelDict:(NSDictionary *)dict;

@end

　　 KZAppModel.m

//
//  KZAppModel.m
//  UI基础-03-05-14
//
//  Created by hukezhu on 15/5/15.
//
//

#import "KZAppModel.h"

@implementation KZAppModel
/*吃唐僧肉的小悟空-转载请注明出处http://www.cnblogs.com/hukezhu/*/
//对象方法
-(instancetype)initWithDict:(NSDictionary *)dict{

    //重写构造方法的默认写法
    if(self = [super init]){
    
        //将字典的所有属性赋值给模型
        self.icon = dict[@"icon"];
        self.name = dict[@"name"];
    }
    return self;
}
//类方法
+(instancetype)appWithModelDict:(NSDictionary *)dict{

    //注意此处是self
    return [[self alloc]initWithDict:dict];
}
@end

 ViewController.m

//
//  ViewController.m
//  03-应用管理
//
//  Created by hukezhu on 15/5/14.
//
//

#import "ViewController.h"
#import "KZAppModel.h"
#import "AppView.h"


@interface ViewController () <AppViewProtocol>
@property (nonatomic,strong)NSArray *apps;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //每一行的应用的个数
    int totalCol = 3;
    /*吃唐僧肉的小悟空-转载请注明出处http://www.cnblogs.com/hukezhu/*/
    
    //添加一个小的view
    CGFloat appW = 80;
    CGFloat appH = 100;
    CGFloat marginX = 20;
    CGFloat marginY = 20;
    CGFloat hightMargin = 30;
    CGFloat leftMargin = (self.view.frame.size.width - totalCol * appW - (totalCol - 1) *marginX)* 0.5;
    
    
    
    for (int i = 0; i < self.apps.count; i++) {
        
        
        //计算行号和列号
        int row = i / totalCol;
        int col = i % totalCol;
        
        CGFloat appX = leftMargin + (marginX + appW)* col;
        CGFloat appY = hightMargin + (marginY + appH)* row;
        
        //1.添加view
    
       
        //首先拿到一个格子视图
//        UIView *appView = [[NSBundle mainBundle]loadNibNamed:@"AppView" owner:nil options:nil][0];

        AppView *appView = [AppView loadNib];
        
        
        //1.2设置frame
        appView.frame = CGRectMake(appX, appY, appW, appH);
        //1.3设置背景色(便于代码阶段验证,之后会删除)
        //appView.backgroundColor = [UIColor redColor];
        //1.4将这个appView添加到view中
        [self.view addSubview:appView];
        
        //加载数据
        //NSDictionary *dict = self.apps[i];
        //将数据赋值给模型对象
        KZAppModel *appModel = self.apps[i];
        
        
        //通过数组的特性拿到里面的小控件,进行赋值
//        UIImageView *imageView = (UIImageView *)appView.subviews[0];
//        imageView.image = [UIImage imageNamed:appModel.icon];
//        
//        UILabel *label = appView.subviews[1];
//        label.text = appModel.name;
        
        
        appView.appViewModel = appModel;
        
        
        
#warning 设置视图的代理为控制器:
        
        appView.delegate = self;
        
        
//        UIButton *downBtn = (UIButton *)appView.subviews[2];
//        [downBtn addTarget:self action:@selector(btnOnClick:) forControlEvents:UIControlEventTouchUpInside];
        
        
//        //2.添加图片UIImageView
//        CGFloat imageW = 60;
//        CGFloat imageH = 50;
//        CGFloat imageX = (appW - imageW)*0.5;
//        CGFloat imageY = 0;
//        UIImageView *imageView = [[UIImageView alloc]init];
//        imageView.frame = CGRectMake(imageX, imageY, imageW, imageH);
//        //imageView.backgroundColor = [UIColor blueColor];
//        //imageView.image = [UIImage imageNamed:dict[@"icon"]];
//        //从模型对象中取出数据
//        imageView.image = [UIImage imageNamed:appModel.icon];
//        [appView addSubview:imageView];
//    
//        
//        //3.添加应用名称
//    
//        CGFloat labelW = 80;
//        CGFloat labelH = 25;
//        CGFloat labelX = 0;
//        CGFloat labelY = imageH;
//        UILabel *label = [[UILabel alloc]init];
//        label.frame = CGRectMake(labelX, labelY, labelW, labelH);
//        //label.backgroundColor = [UIColor grayColor];
//        //label.text = dict[@"name"];
//        //从模型对象中取出数据name
//        label.text = appModel.name;
//        
//        //设置字体大小
//        label.font = [UIFont systemFontOfSize:13];
//        //设置字体居中
//        label.textAlignment = NSTextAlignmentCenter;
//        [appView addSubview:label];
//        
//        //4.添加下载按钮
//        
//        CGFloat downloadW = 60;
//        CGFloat downloadH = 25;
//        CGFloat downloadX = 10;
//        CGFloat downloadY = labelH + labelY;
//        UIButton *downloadBtn = [[UIButton alloc]init];
//        downloadBtn.frame = CGRectMake(downloadX, downloadY, downloadW, downloadH);
//        //downloadBtn.backgroundColor = [UIColor yellowColor];
//        //设置背景图片
//        [downloadBtn setBackgroundImage:[UIImage imageNamed:@"buttongreen"] forState:UIControlStateNormal];
//        [downloadBtn setBackgroundImage:[UIImage imageNamed:@"buttongreen_highlighted"] forState:UIControlStateHighlighted];
//        //设置字体第一种方法
//        [downloadBtn setTitle:@"下载" forState:UIControlStateNormal];
//        
//        //设置字体第二种方法(不推荐使用)
//        downloadBtn.titleLabel.text = @"下载";
//        
//        //设置字体大小
//        downloadBtn.titleLabel.font = [UIFont systemFontOfSize:15];
//        [appView addSubview:downloadBtn];
//        
//        
//        [downloadBtn addTarget:self action:@selector(btnOnClick:) forControlEvents:UIControlEventTouchUpInside];
    }
    
 
    
    
    
}



-(void)appViewDownload:(AppView *)appView{

    
    
    CGFloat labelW = 120;
    CGFloat labelH = 30;
    CGFloat labelX = (self.view.frame.size.width - labelW)* 0.5;
    CGFloat labelY = (self.view.frame.size.height - labelH)*0.5;
    UILabel *label = [[UILabel alloc]init];
    label.frame = CGRectMake(labelX, labelY, labelW, labelH);
    label.text = @"正在下载";
    //设置字体颜色
    label.textColor = [UIColor redColor];
    //设置字体居中
    label.textAlignment = NSTextAlignmentCenter;
    //设置 背景色
    label.backgroundColor = [UIColor blackColor];
    
    //设置圆角的半径
    label.layer.cornerRadius = 8;
    //将多余的部分减掉
    label.layer.masksToBounds = YES;
    //设置透明度
    label.alpha = 0.0;
    //将label添加到view中
    [self.view addSubview:label];
    //使用block动画,动画持续时间2秒
    [UIView animateWithDuration:2.0 animations:^{
        label.alpha = 0.5;
    } completion:^(BOOL finished) {
        if (finished) {
            [UIView animateWithDuration:2.0 delay:0.1 options:UIViewAnimationOptionCurveLinear animations:^{
                label.alpha = 0.0;
            } completion:^(BOOL finished) {
                //上面将透明度设置为0,界面上已经不显示这个label,但是它仍然在内存中,所以为了节约内存,仍要将其从内存中删除
                [label removeFromSuperview];
                
            }];
        }
    }];
}
/**
 *  "懒加载",加载应用数据
 *
 */
- (NSArray *)apps{

    //如果_apps为空,才加载数据
    if (_apps == nil) {
        //获取plist的全路径
        NSString *path = [[NSBundle mainBundle]pathForResource:@"app.plist" ofType:nil];

        //加载数组
        NSArray *dictArray = [NSArray arrayWithContentsOfFile:path];
        
        //创建一个可变数组,来动态接收模型对象
        NSMutableArray *array = [NSMutableArray array];
        
        //通过循环,将字典数组的字典取出,转成模型对象
        for (NSDictionary *dict in dictArray) {
            KZAppModel *appModel = [KZAppModel appWithModelDict:dict];
            [array addObject:appModel];
        }
        _apps = array;
    }
    return _apps;
    /*吃唐僧肉的小悟空-转载请注明出处http://www.cnblogs.com/hukezhu/*/
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end