iOS - NSString 封裝

在實際項目開發過程中，發現字元串使用頻率還是非常高的，NSString提供了很多相關的API，但是在開發過程中發現很多業務功能都是相同的。因此根據在開發過程中遇到的字元串使用場景，進行了簡單封裝。具體代碼如下：

NSString+Category.h 代碼:

//
//  NSString+Category.h
//  myApplication
//
//  Created by xujinzhong on 2018/3/13.
//  Copyright © 2018年 xujinzhong. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSString (Category)

- (BOOL)isBlank;
- (BOOL)isValid;
- (NSString *)removeWhiteSpacesFromString;

- (NSUInteger)countNumberOfWords;
- (BOOL)containsString:(NSString *)subString;
- (BOOL)isBeginsWith:(NSString *)string;
- (BOOL)isEndssWith:(NSString *)string;

- (NSString *)replaceCharcter:(NSString *)olderChar withCharcter:(NSString *)newerChar;
- (NSString*)getSubstringFrom:(NSInteger)begin to:(NSInteger)end;
- (NSString *)addString:(NSString *)string;
- (NSString *)removeSubString:(NSString *)subString;

- (BOOL)containsOnlyLetters;
- (BOOL)containsOnlyNumbers;
- (BOOL)containsOnlyNumbersAndLetters;
- (BOOL)isInThisarray:(NSArray*)array;

+ (NSString *)getStringFromArray:(NSArray *)array;
- (NSArray *)getArray;

+ (NSString *)getMyApplicationVersion;
+ (NSString *)getMyApplicationName;

- (NSData *)convertToData;
+ (NSString *)getStringFromData:(NSData *)data;

- (BOOL)isValidEmail;
- (BOOL)isVAlidPhoneNumber;
- (BOOL)isValidUrl;

@end

NSString+Category.m 代碼:

//
//  NSString+Category.m
//  myApplication
//
//  Created by xujinzhong on 2018/3/13.
//  Copyright © 2018年 xujinzhong. All rights reserved.
//

#import "NSString+Category.h"

@implementation NSString (Category)

//字元串是否為空
-(BOOL)isBlank
{
    return ([[self removeWhiteSpacesFromString] isEqualToString:@""]) ? YES : NO;
}

//字元串為空或nil
-(BOOL)isValid
{
    return ([[self removeWhiteSpacesFromString] isEqualToString:@""] || self == nil || [self isEqualToString:@"(null)"]) ? NO :YES;
}

//在字元串中刪除空格
- (NSString *)removeWhiteSpacesFromString
{
    NSString *trimmedString = [self stringByTrimmingCharactersInSet:
                               [NSCharacterSet whitespaceAndNewlineCharacterSet]];
    return trimmedString;
}

//字元串中包含單詞數
- (NSUInteger)countNumberOfWords
{
    NSScanner *scanner = [NSScanner scannerWithString:self];
    NSCharacterSet *whiteSpace = [NSCharacterSet whitespaceAndNewlineCharacterSet];
    
    NSUInteger count = 0;
    while ([scanner scanUpToCharactersFromSet: whiteSpace  intoString: nil]) {
        count++;
    }
    
    return count;
}

// 字元串中是否包含子字元串
- (BOOL)containsString:(NSString *)subString
{
    return ([self rangeOfString:subString].location == NSNotFound) ? NO : YES;
}

// 字元串從給定的字元串開始
- (BOOL)isBeginsWith:(NSString *)string
{
    return ([self hasPrefix:string]) ? YES : NO;
}

// 字元串以給定的字元串結束
- (BOOL)isEndssWith:(NSString *)string
{
    return ([self hasSuffix:string]) ? YES : NO;
}

// 用新字元替換字元串中的特定字元
- (NSString *)replaceCharcter:(NSString *)olderChar withCharcter:(NSString *)newerChar
{
    return  [self stringByReplacingOccurrencesOfString:olderChar withString:newerChar];
}

// 從特定的位置獲取子字元串，以使其正確
- (NSString*)getSubstringFrom:(NSInteger)begin to:(NSInteger)end
{
    NSRange r;
    r.location = begin;
    r.length = end - begin;
    return [self substringWithRange:r];
}

// 將子字元串添加到主字元串
- (NSString *)addString:(NSString *)string
{
    if(!string || string.length == 0)
        return self;
    
    return [self stringByAppendingString:string];
}

// 從字元串中刪除指定字元串
-(NSString *)removeSubString:(NSString *)subString
{
    if ([self containsString:subString])
    {
        NSRange range = [self rangeOfString:subString];
        return  [self stringByReplacingCharactersInRange:range withString:@""];
    }
    return self;
}

// 字元串只包含字母
- (BOOL)containsOnlyLetters
{
    NSCharacterSet *letterCharacterset = [[NSCharacterSet letterCharacterSet] invertedSet];
    return ([self rangeOfCharacterFromSet:letterCharacterset].location == NSNotFound);
}

// 字元串只包含數字
- (BOOL)containsOnlyNumbers
{
    NSCharacterSet *numbersCharacterSet = [[NSCharacterSet characterSetWithCharactersInString:@"0123456789"] invertedSet];
    return ([self rangeOfCharacterFromSet:numbersCharacterSet].location == NSNotFound);
}

// 字元串中包含數字和字母
- (BOOL)containsOnlyNumbersAndLetters
{
    NSCharacterSet *numAndLetterCharSet = [[NSCharacterSet alphanumericCharacterSet] invertedSet];
    return ([self rangeOfCharacterFromSet:numAndLetterCharSet].location == NSNotFound);
}

// 字元串包含在數組中
- (BOOL)isInThisarray:(NSArray*)array
{
    for(NSString *string in array) {
        if([self isEqualToString:string]) {
            return YES;
        }
    }
    return NO;
}

// 數組轉換為字元串
+ (NSString *)getStringFromArray:(NSArray *)array
{
    return [array componentsJoinedByString:@" "];
}

// 字元串轉換為數組
- (NSArray *)getArray
{
    return [self componentsSeparatedByString:@" "];
}

// 獲取應用程式版本
+ (NSString *)getMyApplicationVersion
{
    NSDictionary *info = [[NSBundle mainBundle] infoDictionary];
    NSString *version = [info objectForKey:@"CFBundleVersion"];
    return version;
}

// 獲取應用程式名稱
+ (NSString *)getMyApplicationName
{
    NSDictionary *info = [[NSBundle mainBundle] infoDictionary];
    NSString *name = [info objectForKey:@"CFBundleDisplayName"];
    return name;
}

// 字元串轉換為NSData
- (NSData *)convertToData
{
    return [self dataUsingEncoding:NSUTF8StringEncoding];
}

// NSData轉換為字元串
+ (NSString *)getStringFromData:(NSData *)data
{
    return [[NSString alloc] initWithData:data
                                 encoding:NSUTF8StringEncoding];
}

// 是否為郵件格式
- (BOOL)isValidEmail
{
    NSString *regex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTestPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
    return [emailTestPredicate evaluateWithObject:self];
}

// 是否為電話格式
- (BOOL)isVAlidPhoneNumber
{
    NSString *regex = @"[235689][0-9]{6}([0-9]{3})?";
    NSPredicate *test = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
    return [test evaluateWithObject:self];
}

// 是否為URL格式
- (BOOL)isValidUrl
{
    NSString *regex =@"(http|https)://((\\w)*|([0-9]*)|([-|_])*)+([\\.|/]((\\w)*|([0-9]*)|([-|_])*))+";
    NSPredicate *urlTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
    return [urlTest evaluateWithObject:self];
}

@end