iOS常用的封装方法

  做开发也有一段时间了，看了好多大神的代码，总体感觉他们写的代码简洁，好看，然而在对比下我写的代码，混乱，无序，简直不堪入目啊！

                总体来说大神们的代码封装的都比较好，对一个项目要重复用到的代码他们都会封装起来，这样用起来的时候也比较方便，也不用重复的去写这段代码了！

               下面是我在开发中封装到的一些经常使用的一些方法，如有写错的地方或者大家有更好的方法，还请大家给我提出来，大家一起学习！谢谢！

1.常用控件方法的封装：

#import<Foundation/Foundation.h>

#import<UIKit/UIKit.h>

@interface MyUtil :NSObject

//创建标签的方法

+ (UILabel *)createLabelFrame:(CGRect)frame text:(NSString *)text textColor:(UIColor *)textColor textAlignment:(NSTextAlignment)textAlignment numberOfLines:(NSInteger)numberOfLines;

+ (UILabel *)createLabelFrame:(CGRect)frame text:(NSString *)text color:(UIColor *)textColor;

//创建按钮的方法

+ (UIButton *)createBtnFrame:(CGRect)frame title:(NSString *)title bgImageName:(NSString *)bgImageName target:(id)target action:(SEL)action;

//创建图片视图的方法

+ (UIImageView *)createImageViewFrame:(CGRect)frame imageName:(NSString *)imageName;

//类型的英文转化成中文

+ (NSString *)transferCateName:(NSString *)name;

@end

方法的实现：

#import"MyUtil.h"

@implementation MyUtil

+(UILabel *)createLabelFrame:(CGRect)frame text:(NSString *)text textColor:(UIColor *)textColor textAlignment:(NSTextAlignment)textAlignment numberOfLines:(NSInteger)numberOfLines

{

    UILabel *label = [[UILabelalloc]initWithFrame:frame];

    label.text = text;

    label.textAlignment = textAlignment;

    label.textColor = textColor;

    label.numberOfLines = numberOfLines;

    

    return label;

}

+(UILabel *)createLabelFrame:(CGRect)frame text:(NSString *)text color:(UIColor *)textColor

{

    return [selfcreateLabelFrame:frametext:texttextColor:textColortextAlignment:NSTextAlignmentCenternumberOfLines:1];

}

+(UIButton *)createBtnFrame:(CGRect)frame title:(NSString *)title bgImageName:(NSString *)bgImageName target:(id)target action:(SEL)action

{

    UIButton *btn = [UIButtonbuttonWithType:UIButtonTypeCustom];

    btn.frame = frame;

    [btnsetTitle:titleforState:UIControlStateNormal];

    [btnsetTitleColor:[UIColorblackColor]forState:UIControlStateNormal];

    [btnsetBackgroundImage:[UIImageimageNamed:bgImageName]forState:UIControlStateNormal];

    [btnaddTarget:targetaction:actionforControlEvents:UIControlEventTouchUpInside];

    return btn;

}

+(UIImageView *)createImageViewFrame:(CGRect)frame imageName:(NSString *)imageName

{

    UIImageView *imageView = [[UIImageViewalloc]initWithFrame:frame];

    imageView.image = [UIImageimageNamed:imageName];

    return imageView;

}

+ (NSString *)transferCateName:(NSString *)name

{

    

    if ([name isEqualToString:@"Business"]) {

       return@"商业";

    }elseif ([nameisEqualToString:@"Weather"]) {

       return@"天气";

    }elseif ([nameisEqualToString:@"Tool"]) {

       return@"工具";

    }elseif ([nameisEqualToString:@"Travel"]) {

       return@"旅行";

    }elseif ([nameisEqualToString:@"Sports"]) {

       return@"体育";

    }elseif ([nameisEqualToString:@"Social"]) {

       return@"社交";

    }elseif ([nameisEqualToString:@"Refer"]) {

       return@"参考";

    }elseif ([nameisEqualToString:@"Ability"]) {

       return@"效率";

    }elseif ([nameisEqualToString:@"Photography"]) {

       return@"摄影";

    }elseif ([nameisEqualToString:@"News"]) {

       return@"新闻";

    }elseif ([nameisEqualToString:@"Gps"]) {

       return@"导航";

    }elseif ([nameisEqualToString:@"Music"]) {

       return@"音乐";

    }elseif ([nameisEqualToString:@"Life"]) {

       return@"生活";

    }elseif ([nameisEqualToString:@"Health"]) {

       return@"健康";

    }elseif ([nameisEqualToString:@"Finance"]) {

       return@"财务";

    }elseif ([nameisEqualToString:@"Pastime"]) {

       return@"娱乐";

    }elseif ([nameisEqualToString:@"Education"]) {

       return@"教育";

    }elseif ([nameisEqualToString:@"Book"]) {

       return@"书籍";

    }elseif ([nameisEqualToString:@"Medical"]) {

       return@"医疗";

    }elseif ([nameisEqualToString:@"Catalogs"]) {

       return@"商品指南";

    }elseif ([nameisEqualToString:@"FoodDrink"]) {

       return@"美食";

    }elseif ([nameisEqualToString:@"Game"]) {

       return@"游戏";

    }elseif([nameisEqualToString:@"All"]){

       return@"全部";

    }

    

    return nil;

}

@end

2.裁剪图片方法的封装：

- (UIImage*)clipImage:(UIImage*)bigImage inRect:(CGRect)rect

{

   CGImageRefimageRef =CGImageCreateWithImageInRect(bigImage.CGImage, rect);

   UIImage*image = [UIImageimageWithCGImage:imageRef];

   returnimage;

}

实现方法：

   

            //创建图片显示

            CGRect frame =CGRectMake(100*j,100*i,100,100);

            UIImage *tmpImage = [selfclipImage:imageinRect:frame];

3.封装的下载方法：

#import <Foundation/Foundation.h>

@classMyDownloader;

@protocol MyDownloaderDelegate <NSObject>

- (void)downloadFail:(MyDownloader *)downloader error:(NSError *)error;

- (void)downloadFinish:(MyDownloader *)downloader;

@end

@interface MyDownloader :NSObject<NSURLConnectionDelegate,NSURLConnectionDataDelegate>

- (void)downloadWithURLString:(NSString *)urlString;

@property (nonatomic,readonly)NSData *receiveData;

@property (nonatomic,assign)NSInteger type;

@property (nonatomic,weak)id<MyDownloaderDelegate> delegate;

@end

实现方法：

#import "MyDownloader.h"

@implementation MyDownloader

{

    NSURLConnection *_conn;

    NSMutableData *_receiveData;

}

-(instancetype)init

{

    self = [superinit];

    if (self) {

        _receiveData = [NSMutableDatadata];

    }

    

    returnself;

}

-(void)downloadWithURLString:(NSString *)urlString

{

    NSURL *url = [NSURLURLWithString:urlString];

    NSURLRequest *request = [NSURLRequestrequestWithURL:url];

    _conn = [NSURLConnectionconnectionWithRequest:requestdelegate:self];

}

#pragma mark - NSURLConnection代理

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

{

    [self.delegatedownloadFail:selferror:error];

}

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

    [_receiveDatasetLength:0];

}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

    [_receiveDataappendData:data];

}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection

{

    [self.delegatedownloadFinish:self];

}

4.block封装的下载方法：

#import <Foundation/Foundation.h>

typedefvoid (^FINISHBLOCK)(NSData *receiveData);

typedefvoid (^FAILBLOCK)(NSError *error);

@interface MyDownloader :NSObject<NSURLConnectionDataDelegate,NSURLConnectionDelegate>

{

    NSMutableData *_receiveData;

    

    NSURLConnection *_conn;

    

    //下载成功结束

    //void (^_myFinishBlock)(NSData *data);

    

    FINISHBLOCK _myFinishBlock;

    

    //下载失败时调用

    //void (^_myFailBlock)(NSError *error);

    FAILBLOCK _myFailBlock;

    

}

//下载的方法

/*

 @param urlString:下载的字符串链接

 @param finishBlock:下载成功时调用的代码块

 @param failBlock:下载失败时调用的代码块

 */

/*

- (void)downloadWithURLString:(NSString *)urlString

                       finish:(void (^) (NSData *receiveData))finishBlock

                         fail:(void (^)(NSError *error))failBlock;

 */

- (void)downloadWithURLString:(NSString *)urlString

                       finish:(FINISHBLOCK)finishBlock

                         fail:(FAILBLOCK)failBlock;

@end

实现方法：

#import "MyDownloader.h"

@implementation MyDownloader

-(instancetype)init

{

    if (self = [superinit]) {

        _receiveData = [NSMutableDatadata];

    }

    returnself;

}

-(void)downloadWithURLString:(NSString *)urlString finish:(void (^)(NSData *))finishBlock fail:(void (^)(NSError *))failBlock

{

    if (_myFinishBlock != finishBlock) {

        _myFinishBlock = finishBlock;

    }

    

    if (_myFailBlock != failBlock) {

        _myFailBlock = failBlock;

    }

    

    //下载

    NSURL *url = [NSURLURLWithString:urlString];

    

    NSURLRequest *request = [NSURLRequestrequestWithURL:url];

    

    _conn = [NSURLConnectionconnectionWithRequest:requestdelegate:self];

}

#pragma mark - NSURLConnection代理

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

{

    if (_myFailBlock) {

        _myFailBlock(error);

    }

}

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

    [_receiveDatasetLength:0];

}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

    [_receiveDataappendData:data];

}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection

{

    if (_myFinishBlock) {

        _myFinishBlock(_receiveData);

    }

}

@end

5.数据库的封装：

#import <Foundation/Foundation.h>

#import "UserModel.h"

@interface DBManager :NSObject

+ (DBManager *)sharedManager;

//增

- (void)addUserModel:(UserModel *)model;

//删

- (void)deleteUserWithUserId:(int)userId;

//改

//根据userId修改数据(userId是不变化的)

- (void)updateUserModel:(UserModel *)model userId:(int)userId;

//查

- (NSArray *)searchAllUsers;

@end

实现方法：

#import "DBManager.h"

#import "FMDatabase.h"

/*

使用数据库时

 1.导入fmdatabase第三方库

 2.导入系统libsqlite3.dylib

 3.fmdatabase不支持ARC，五个.m文件添加-fno-objc-arc

 */

@implementation DBManager

{

    //数据库文件的关联对象

    FMDatabase *_dataBase;

}

+(DBManager *)sharedManager

{

    staticDBManager *manager =nil;

    

    @synchronized(self){

        if (manager ==nil) {

            manager = [[DBManageralloc]init];

        }

    }

    

    return manager;

}

-(instancetype)init

{

    if (self = [superinit]) {

        //创建数据库文件操作对象

        [selfcreateDatabase];

    }

    returnself;

}

- (void)createDatabase

{

    //数据库文件的路径

    NSString *path = [NSHomeDirectory()stringByAppendingPathComponent:@"Documents/user.sqlite"];

    NSLog(@"%@",path);

    

    //1、初始化FMDataBase对象

    _dataBase = [[FMDatabasealloc]initWithPath:path];

    

    //2、打开数据库

    BOOL isOpen = [_dataBaseopen];

    if (isOpen) {

        

        //3、创建表格

        //NSData -> blob

        //int -> integer

        //NSString -> varchar(255)

        

        //if not exists:如果表格不存在，创建表格

        //存在就不创建

        

        //主键:primary key,值唯一，不能重复

        //主键自动增长:autoincrement

        NSString *createSql =@"create table if not exists user (userId integer primary key autoincrement, userName varchar(255), age integer,headImage blob)";

        

        BOOL ret = [_dataBaseexecuteUpdate:createSql];

        if (ret) {

            NSLog(@"表格创建成功");

        }else{

            NSLog(@"%@",_dataBase.lastErrorMessage);

        }

        

        

    }else{

        NSLog(@"数据库打开失败");

    }

}

//判断是否存在

- (BOOL)isExists:(NSString *)userName

{

    NSString *sql =@"select * from user where userName = ?";

    FMResultSet *rs = [_dataBaseexecuteQuery:sql, userName];

    if ([rsnext]) {

        returnYES;

    }

    

    returnNO;

}

//增加一条记录

-(void)addUserModel:(UserModel *)model

{

    //判断用户名是否存在

    BOOL isExists = [selfisExists:model.userName];

    if (isExists) {

        NSLog(@"用户名已存在");

        return;

    }

    

    //?是占位符，表示要传一个值

    NSString *insertSql =@"insert into user (userName, age, headImage) values (?, ? ,?)";

    //图片转换成二进制

    NSData *imageData =UIImagePNGRepresentation(model.headImage);

    BOOL ret = [_dataBaseexecuteUpdate:insertSql,model.userName,@(model.age), imageData];

    if (!ret) {

        NSLog(@"%@",_dataBase.lastErrorMessage);

    }

    

    

}

//查询

-(NSArray *)searchAllUsers

{

    

    NSString *selectSql =@"select * from user";

    

    FMResultSet *rs = [_dataBaseexecuteQuery:selectSql];

    

    NSMutableArray *array = [NSMutableArrayarray];

    while ([rsnext]) {

        

        UserModel *model = [[UserModelalloc]init];

        model.userId = [rsintForColumn:@"userId"];

        model.userName = [rsstringForColumn:@"userName"];

        model.age = [rsintForColumn:@"age"];

        

        NSData *data = [rsdataForColumn:@"headImage"];

        model.headImage = [UIImageimageWithData:data];

        

        [array addObject:model];

        

    }

    

    return array;

    

}

//删除

-(void)deleteUserWithUserId:(int)userId

{

    NSString *deleteSql =@"delete from user where userId=?";

    

    BOOL ret = [_dataBaseexecuteUpdate:deleteSql,@(userId)];

    if (!ret) {

        NSLog(@"%@",_dataBase.lastErrorMessage);

    }

}

//修改

-(void)updateUserModel:(UserModel *)model userId:(int)userId

{

    NSString *sql =@"update user set userName=?, age=?, headImage=? where userId=?";

    

    //图片转换成二进制数据

    NSData *data =UIImagePNGRepresentation(model.headImage);

    BOOL ret = [_dataBaseexecuteUpdate:sql, model.userName,@(model.age), data,@(userId)];

    if (!ret) {

        NSLog(@"%@",_dataBase.lastErrorMessage);

    }

    

}

@end

6.UIAlertController的封装方法：

- (void)createAlertViewText:(NSString *)text
{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"温馨提示" message:text preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
    }];
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        
    }];
    [alertController addAction:okAction];
    [alertController addAction:cancelAction];
    [self presentViewController:alertController animated:YES completion:nil];
}

实现方法：

- (void)searchBtnClick
{
    [_licenseNumber resignFirstResponder];
    _dp.hidden = YES;
    _lineView.hidden = YES;
    _endBtn.hidden = YES;
    _showOrHidden = YES;
    NSMutableArray *licens = ((AppDelegate *)[UIApplication sharedApplication].delegate).licen;
    for (int i=0; i<licens.count; i++) {
        
        if ([_licenseNumber.text isEqualToString: licens[i]]) {
            [self createData];
        }
    }
    if ([_licenseNumber.text  isEqual: @""])
    {
        [self createAlertViewText:@"车牌号不能为空"];
    }


    if ([_dateBtn.titleLabel.text  isEqual: @"查询日期"])
    {
        [self createAlertViewText:@"请选择日期"];
    }


}