這篇文章主要爲大家詳細介紹了iOS通過按鈕添加和刪除控件的方法,具有一定的參考價值,感興趣的小夥伴們可以參考一下
本文實例爲大家分享了iOS通過按鈕添加和刪除控件,供大家參考,具體內容如下
想要達到的效果如下:
先講一下這個demo主要部分,即通過按鈕實現增刪圖標
分析:
1、每一個圖標需要兩個數據,即圖片和描述用的字符串 ,所以創建一個Item類來封裝從plist文件讀取出來的數據:
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、然後創建一個Model類用於封裝自定義的圖標模型,我的模型是將Model類繼承於UIScrollView類,然後設置其可以滾動,然後再創建一個佔據整個scrollview可滾動部分大小的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,結構如下
重寫model的init方法,在創建對象時用item對象初始化:
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) { //設置模塊 self.contentSize = CGSizeMake(80, self.frame.size.height * 2); self.pagingEnabled = NO; //設置模塊屬性 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]; //設置button是否被點擊 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的點擊事件:即點擊圖片文字描述就會從下面升上來,再點擊就會降下去的動作:
/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,由於必須保證每次添加model到視圖上時顯示的是圖片,所以需要一個方法來複原到初始狀態,即一旦從視圖上刪除就復原:
//復原 -(void)resetModel{ self.contentOffset = CGPointMake(0, 0); self.isClicked = NO; }
3、模型準備好了,下面在viewController類裏面寫一個方法將plist文件數據讀取出來封裝到item對象裏面,再用item對象初始化model對象,將所有model對象存入可變數組(_allItems)裏面:
//加載數據到物品 -(void)loadData{ //讀取數據 NSString *filePath = [[NSBundle mainBundle] pathForResource:@"shop" ofType:@"plist"]; NSArray *itemArr = [NSArray arrayWithContentsOfFile:filePath]; //創建模型 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]; //未被添加的爲0,添加好的爲1 model.tag = 0; [_allItems addObject:model]; } }
**注意:**model的tag是用於判斷model是否已經被添加到視圖裏面,從而只會添加數組裏面未添加的model,已添加的model也會用一個數組(displayedItems)來存儲,方便刪除
4、添加和刪除按鈕及其響應的方法:
1)add按鈕:
創建:
//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]; }
嗯,由於這裏爲了方便,所以添加控件時的位置判斷直接寫死了,所以還有待改進。以上就是用按鈕添加控件這個demo的主要部分,另外還有那個背景圖片的模糊處理使用的是UIVisualEffectView類實現的,在此不詳述了。
代碼不足之處:
1、位置判斷寫死了
2、模型其實建一個類就夠了,Item類有點多餘
進階方案:
1、通過拖動圖標放置在父視圖任何位置
2、點擊控件文字顯示於圖片之上,圖片成爲背景並虛化
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持神馬文庫。