iOS实现通过按钮添加和删除控件的方法

来源：jb51　　时间：2019/3/25 8:56:29　　对本文有异议

本文实例为大家分享了iOS通过按钮添加和删除控件，供大家参考，具体内容如下

想要达到的效果如下:

先讲一下这个demo主要部分,即通过按钮实现增删图标

分析：

1、每一个图标需要两个数据，即图片和描述用的字符串，所以创建一个Item类来封装从plist文件读取出来的数据：

1）plist文件如下：

2）Item类：

.h文件

#import <Foundation/Foundation.h>
 
@interface Item : NSObject
//描述的字符串
@property(nonatomic,copy)NSString * desStr;
//图片路径
@property(nonatomic,copy)NSString * imgPath;
 
-(instancetype)initWithString:(NSString *)desStr andimgPath:(NSString *)imgPath;
 
@end

.m文件

#import "Item.h"
 
@implementation Item
 
-(instancetype)initWithString:(NSString *)desStr andimgPath:(NSString *)imgPath{
 self = [super init];
 if (self) {
  self.desStr = desStr;
  self.imgPath = imgPath;
 }
 return self;
}
 
@end

2、然后创建一个Model类用于封装自定义的图标模型，我的模型是将Model类继承于UIScrollView类，然后设置其可以滚动，然后再创建一个占据整个scrollview可滚动部分大小的button添加上去。再分别在button上半部分添加UIImageView显示图片，在下半部分添加UILabel显示描述文字，结构如下

重写model的init方法，在创建对象时用item对象初始化：
model类：

1）.h文件

#import <UIKit/UIKit.h>
#import "Item.h"
 
@interface Model : UIScrollView
 
@property(nonatomic,strong)UIButton *button;
@property(nonatomic,strong)UILabel *label;
//判断button是否被点击
@property(nonatomic,assign)BOOL isClicked;
 
 
-(instancetype)initWithItem:(Item *)item;
 
//重置模型
-(void)resetModel;
 
@end

2）.m文件

-(instancetype)initWithItem:(Item *)item{
 self = [super initWithFrame:CGRectMake(20, 20, 80, 100)];
 if (self) {
  //设置模块
  self.contentSize = CGSizeMake(80, self.frame.size.height * 2);
  self.pagingEnabled = NO;
  
  
  //设置模块属性
  self.button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.contentSize.height)];
  [self.button addTarget:self action:@selector(buttonDidClicked) forControlEvents:UIControlEventTouchUpInside];
  //添加图片视图到button上
  UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
  [imgView setImage:[UIImage imageNamed:item.imgPath]];
  [self.button addSubview:imgView];
  //设置button是否被点击
  self.isClicked = NO;
  [self addSubview:self.button];
  
  self.label = [[UILabel alloc] initWithFrame:CGRectMake(0, self.frame.size.height, self.frame.size.width, self.frame.size.height)];
  self.label.text = item.desStr;
  self.label.font = [UIFont systemFontOfSize:15];
  self.label.textColor = [UIColor blackColor];
  self.label.numberOfLines = 0;
  self.label.textAlignment = NSTextAlignmentLeft;
  [self addSubview:self.label];
 }
 return self;
}

3）button的点击事件：即点击图片文字描述就会从下面升上来，再点击就会降下去的动作：

/label升降
-(void)buttonDidClicked{
 if (self.isClicked == NO) {
  [UIView animateWithDuration:0.5 animations:^{
   self.contentOffset = CGPointMake(0, self.frame.size.height);
  }];
  self.isClicked = YES;
 }else if (self.isClicked == YES) {
  [UIView animateWithDuration:0.5 animations:^{
   self.contentOffset = CGPointMake(0, 0);
  }];
  self.isClicked = NO;
 }
}

另外，由于必须保证每次添加model到视图上时显示的是图片，所以需要一个方法来复原到初始状态，即一旦从视图上删除就复原：

//复原
-(void)resetModel{
  self.contentOffset = CGPointMake(0, 0);
  self.isClicked = NO;
}

3、模型准备好了，下面在viewController类里面写一个方法将plist文件数据读取出来封装到item对象里面，再用item对象初始化model对象，将所有model对象存入可变数组（_allItems）里面：

//加载数据到物品
-(void)loadData{
//读取数据
 NSString *filePath = [[NSBundle mainBundle] pathForResource:@"shop" ofType:@"plist"];
 NSArray *itemArr = [NSArray arrayWithContentsOfFile:filePath];
 //创建模型
 for (int i =0;i <[itemArr count] ; i++) {
  Item *item = [[Item alloc] initWithString:[[itemArr objectAtIndex:i] objectForKey:@"title"] andimgPath:[[itemArr objectAtIndex:i] objectForKey:@"pic"]];
  Model *model = [[Model alloc] initWithItem:item];
  //未被添加的为0，添加好的为1
  model.tag = 0;
  [_allItems addObject:model];
 }
}

**注意：**model的tag是用于判断model是否已经被添加到视图里面，从而只会添加数组里面未添加的model，已添加的model也会用一个数组(displayedItems)来存储，方便删除

4、添加和删除按钮及其响应的方法：

1)add按钮：

创建：

//添加添加按钮
 UIButton *addButton = [[UIButton alloc] initWithFrame:CGRectMake(_width*2/3, _height/10, 40, 40)];
 [addButton setImage:[UIImage imageNamed:@"add"] forState:UIControlStateNormal];
 [addButton addTarget:self action:@selector(add) forControlEvents:UIControlEventTouchUpInside];
 [self.view addSubview:addButton];

add方法：

//添加事件
-(void)add{
 NSInteger itemCount = [_displayedItems count];
 for (Model* model in _allItems) {
  if (model.tag == 0) {
   switch (itemCount) {
    case 1:
     model.frame = CGRectMake(40 + model.frame.size.width, 20, 80, 100);
     break;
    case 2:
     model.frame = CGRectMake(60 + model.frame.size.width*2, 20, 80, 100);
     break;
    case 3:
     model.frame = CGRectMake(20,40 + model.frame.size.height, 80, 100);
     break;
    case 4:
     model.frame = CGRectMake(40 + model.frame.size.width, 40 + model.frame.size.height, 80, 100);
     break;
    case 5:
     model.frame = CGRectMake(60 + model.frame.size.width*2, 40 + model.frame.size.height, 80, 100);
     break;
    default:
     break;
   }
   [_scrollView addSubview:model];
   [_displayedItems addObject:model];
   model.tag = 1;
   break;
  }
 }
}

2）delete按钮：

//添加删除按钮
 UIButton *deleteButton = [[UIButton alloc] initWithFrame: CGRectMake(_width/5, _height/10, 40, 40)];
 [deleteButton setImage:[UIImage imageNamed:@"delete"] forState:UIControlStateNormal];
 [deleteButton addTarget:self action:@selector(delete) forControlEvents:UIControlEventTouchUpInside];
 [self.view addSubview:deleteButton];

delete方法：

-(void)delete{
 Model *model = _displayedItems.lastObject;
 [model removeFromSuperview];
 model.tag = 0;
 [model resetModel];
 [_displayedItems removeObject:model];
}