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這篇文章給大家介紹怎么在iOS中通過(guò)按鈕添加和刪除控件,內(nèi)容非常詳細(xì),感興趣的小伙伴們可以參考借鑒,希望對(duì)大家能有所幫助。
分析:
1、每一個(gè)圖標(biāo)需要兩個(gè)數(shù)據(jù),即圖片和描述用的字符串 ,所以創(chuàng)建一個(gè)Item類來(lái)封裝從plist文件讀取出來(lái)的數(shù)據(jù):
1)plist文件如下:
2)Item類:
.h文件
#import <Foundation/Foundation.h> @interface Item : NSObject //描述的字符串 @property(nonatomic,copy)NSString * desStr; //圖片路徑 @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、然后創(chuàng)建一個(gè)Model類用于封裝自定義的圖標(biāo)模型,我的模型是將Model類繼承于UIScrollView類,然后設(shè)置其可以滾動(dòng),然后再創(chuàng)建一個(gè)占據(jù)整個(gè)scrollview可滾動(dòng)部分大小的button添加上去。再分別在button上半部分添加UIImageView顯示圖片,在下半部分添加UILabel顯示描述文字,結(jié)構(gòu)如下
重寫model的init方法,在創(chuàng)建對(duì)象時(shí)用item對(duì)象初始化:
model類:
1).h文件
#import <UIKit/UIKit.h> #import "Item.h" @interface Model : UIScrollView @property(nonatomic,strong)UIButton *button; @property(nonatomic,strong)UILabel *label; //判斷button是否被點(diǎn)擊 @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) { //設(shè)置模塊 self.contentSize = CGSizeMake(80, self.frame.size.height * 2); self.pagingEnabled = NO; //設(shè)置模塊屬性 self.button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.contentSize.height)]; [self.button addTarget:self action:@selector(buttonDidClicked) forControlEvents:UIControlEventTouchUpInside]; //添加圖片視圖到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]; //設(shè)置button是否被點(diǎn)擊 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的點(diǎn)擊事件:即點(diǎn)擊圖片文字描述就會(huì)從下面升上來(lái),再點(diǎn)擊就會(huì)降下去的動(dòng)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,由于必須保證每次添加model到視圖上時(shí)顯示的是圖片,所以需要一個(gè)方法來(lái)復(fù)原到初始狀態(tài),即一旦從視圖上刪除就復(fù)原:
//復(fù)原 -(void)resetModel{ self.contentOffset = CGPointMake(0, 0); self.isClicked = NO; }
3、模型準(zhǔn)備好了,下面在viewController類里面寫一個(gè)方法將plist文件數(shù)據(jù)讀取出來(lái)封裝到item對(duì)象里面,再用item對(duì)象初始化model對(duì)象,將所有model對(duì)象存入可變數(shù)組(_allItems)里面:
//加載數(shù)據(jù)到物品 -(void)loadData{ //讀取數(shù)據(jù) NSString *filePath = [[NSBundle mainBundle] pathForResource:@"shop" ofType:@"plist"]; NSArray *itemArr = [NSArray arrayWithContentsOfFile:filePath]; //創(chuàng)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]; //未被添加的為0,添加好的為1 model.tag = 0; [_allItems addObject:model]; } }
**注意:**model的tag是用于判斷model是否已經(jīng)被添加到視圖里面,從而只會(huì)添加數(shù)組里面未添加的model,已添加的model也會(huì)用一個(gè)數(shù)組(displayedItems)來(lái)存儲(chǔ),方便刪除
4、添加和刪除按鈕及其響應(yīng)的方法:
1)add按鈕:
創(chuàng)建:
//添加添加按鈕 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按鈕:
//添加刪除按鈕 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]; }
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