App開發流程之字串處理工具類，app工具類

App開發流程之字串處理工具類，app工具類

記錄字串的處理，不是一個簡單的工作。

NSString是代碼中隨處可見的類型，也是應用和處理繁多的對象，在此只記錄需要常備的方法，並且加以說明。

#pragma mark -- 【計算字串尺寸+ (CGSize)getStringSizeWith:(NSString *)string attributes:(NSDictionary *)attributes;+ (CGSize)getStringSizeWith:(NSString *)string attributes:(NSDictionary *)attributes maxWidth:(CGFloat)maxWidth;+ (CGSize)getStringSizeWith:(NSString *)string attributes:(NSDictionary *)attributes maxHeight:(CGFloat)maxHeight;+ (CGSize)getStringSizeWith:(NSString *)string font:(UIFont *)font paragraphStyle:(NSParagraphStyle *)paragraphStyle maxWidth:(CGFloat)maxWidth;+ (CGSize)getStringSizeWith:(NSString *)string font:(UIFont *)font lineHeight:(CGFloat)lineHeight maxWidth:(CGFloat)maxWidth;+ (CGSize)getStringSizeWith:(NSString *)string font:(UIFont *)font;+ (CGSize)getStringSizeWith:(NSString *)string font:(UIFont *)font maxWidth:(CGFloat)maxWidth;+ (CGSize)getStringSizeWith:(NSString *)string font:(UIFont *)font maxHeight:(CGFloat)maxHeight;#pragma mark -- 】計算字串尺寸#pragma mark -- 【產生屬性字串+ (NSAttributedString *)getAttributedStringWithString:(NSString *)string font:(UIFont *)font color:(UIColor *)color lineHeight:(CGFloat)lineHeight maxWidth:(CGFloat)maxWidth;+ (NSAttributedString *)getAttributedStringWithString:(NSString *)string font:(UIFont *)font color:(UIColor *)color paragraphStyle:(NSParagraphStyle *)paragraphStyle maxWidth:(CGFloat)maxWidth;#pragma mark -- 】產生屬性字串#pragma mark -- 【處理時間字串+ (NSString *)getCurrentDateString;+ (NSString *)getCurrentDateStringWithFormat:(NSString *)dateFormat;+ (NSString *)getDateStringWithTimeInterval:(NSTimeInterval)timeInterval;+ (NSString *)getDateStringWithTimeInterval:(NSTimeInterval)timeInterval dateFormat:(NSString *)dateFormat;+ (NSTimeInterval)getTimeIntervalWithDateString:(NSString *)dateString;+ (NSDateComponents *)getDateComponentsWithDateString:(NSString *)dateString;+ (NSDateComponents *)getDateComponentsWithTimeInterval:(NSTimeInterval)timeInterval;+ (NSString *)getContentPublishedTimeStringWithDateString:(NSString *)dateString;#pragma mark -- 】處理時間字串#pragma mark -- 【處理網路請求相關字串+ (NSString *)getSafeDecodeStringFromJsonValue:(NSString *)jsonValue;/** *  被解析的url字串格式為：xxxxxx?a=xxx&b=xxx * *  @param urlString urlString description * *  @return return value description */+ (NSDictionary *)getParametersDictionaryWithUrlString:(NSString *)urlString;/** *  被解析的url字串格式為：xxxxxx/realname_320x640.png(/jpg) * *  @param urlString urlString description * *  @return return value description */+ (CGSize)getImageOriginalSizeWithUrlString:(NSString *)urlString;+ (CGSize)getImageShowSizeWithUrlString:(NSString *)urlString maxWidth:(NSInteger)maxWidth;/** *  被解析的url字串格式為：xxxxxx/realname_320x640.png(/jpg) * *  @param originalUrlString originalUrlString description *  @param newWidth          newWidth description * *  @return 在原urlString後增加類似"?act=resize&x=320"，用於伺服器裁剪尺寸 */+ (NSString *)getImageResizedUrlStringWithOriginalUrlString:(NSString *)originalUrlString newWidth:(NSInteger)newWidth;#pragma mark -- 】處理網路請求相關字串#pragma mark -- 其他功能方法/** *  擷取字串的位元組長度（一個漢字佔兩個位元組長度） * *  @param string string description * *  @return return value description */+ (NSInteger)getBytesLengthWithString:(NSString *)string;/** *  驗證手機號是否合理 * *  @param phoneNum phoneNum description * *  @return return value description */+ (BOOL)isValidatedMobliePhoneNum:(NSString *)phoneNum;+ (void)printAllCurrentSupportedFonts;+ (NSString *)getDeviceVersion;+ (NSString *)getAppShortVersion;+ (NSString *)getAppBundleVersion;

 

說明：

1.計算字串尺寸的方法，sizeWithFont系列方法已經被廢物，建議改為boundingRectWithSize方法；NSAttributedString也有boundingRectWithSize方法，如果已知屬性字串可以直接使用。請查看UIKit/NSStringDrawing.h中NSString和NSAttributedString的擴充方法

 

+ (CGSize)getStringSizeWith:(NSString *)string attributes:(NSDictionary *)attributes{    CGSize size = [string boundingRectWithSize:CGSizeMake(MAXFLOAT, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil].size;        return size;}

 

3.產生屬性字串的方法中，NSMutableParagraphStyle的對象用於設定段落屬性（行高、行間距、段落間距、對齊、書寫方向、首行縮排、行首縮排、行尾縮排），請查看UIKit/NSParagraphStyle.h

+ (NSAttributedString *)getAttributedStringWithString:(NSString *)string font:(UIFont *)font color:(UIColor *)color lineHeight:(CGFloat)lineHeight maxWidth:(CGFloat)maxWidth{    CGFloat perLineHeight = [StringHelper getStringSizeWith:@"內容" font:font].height;    CGFloat lineSpacing = (lineHeight - perLineHeight)/2.5;//2.5是在實際應用中，調校的值    perLineHeight = lineHeight - lineSpacing;        //設定文欄位落    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];    paragraphStyle.lineHeightMultiple = perLineHeight;    paragraphStyle.maximumLineHeight = perLineHeight;    paragraphStyle.minimumLineHeight = perLineHeight;    paragraphStyle.lineBreakMode = commonLineBreakMode;    paragraphStyle.lineSpacing = lineSpacing;//行間距    paragraphStyle.paragraphSpacing = 0;//段間距    paragraphStyle.alignment = commonTextAlignment;    return [self getAttributedStringWithString:string font:font color:color paragraphStyle:paragraphStyle maxWidth:maxWidth];}+ (NSAttributedString *)getAttributedStringWithString:(NSString *)string font:(UIFont *)font color:(UIColor *)color paragraphStyle:(NSParagraphStyle *)paragraphStyle maxWidth:(CGFloat)maxWidth{    NSMutableDictionary *dic = [NSMutableDictionary dictionary];    [dic setObject:font forKey:NSFontAttributeName];    [dic setObject:color forKey:NSForegroundColorAttributeName];    [dic setObject:paragraphStyle forKey:NSParagraphStyleAttributeName];        NSAttributedString* attributedString;        if (string == nil) {        attributedString = [[NSAttributedString alloc] initWithString:@" " attributes:dic];    }else{        attributedString = [[NSAttributedString alloc] initWithString:string attributes:dic];    }        return attributedString;}

 

4.NSFontAttributeName、NSForegroundColorAttributeName、NSParagraphStyleAttributeName為NSAttributedString常用屬性索引值，更多查看UIKit/NSAttributedString.h

5.轉換時間字串，需要記錄一下常用時間格式佔位字元：

#pragma mark -- 時間格式預留位置//G:        公元時代，例如AD公元//yy:       年的後2位//yyyy:     完整年//MM:       月，顯示為1-12,帶前置0//MMM:      月，顯示為英文月份簡寫,如 Jan//MMMM:     月，顯示為英文月份全稱，如 Janualy//dd:       日，2位元表示，如02//d:        日，1-2位顯示，如2，無前置0//EEE:      簡寫星期幾，如Sun//EEEE:     全寫星期幾，如Sunday//aa:       上下午，AM/PM//H:        時，24小時制，0-23//HH:       時，24小時制，帶前置0//h:        時，12小時制，無前置0//hh:       時，12小時制，帶前置0//m:        分，1-2位//mm:       分，2位，帶前置0//s:        秒，1-2位//ss:       秒，2位，帶前置0//S:        毫秒//Z:        GMT（時區）

+ (NSString *)getCurrentDateString{    return [self getCurrentDateStringWithFormat:@"yyyy-MM-dd HH:mm:ss"];}+ (NSString *)getCurrentDateStringWithFormat:(NSString *)dateFormat{    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    [dateFormatter setDateFormat:dateFormat];    NSDate *currentDate = [NSDate date];    NSString *currentDateString = [dateFormatter stringFromDate:currentDate];        return currentDateString;}

 

6.getDateComponentsWithDateString方法用於得到日期組成對象，實現代碼、測試代碼、輸入log如下：

+ (NSDateComponents *)getDateComponentsWithDateString:(NSString *)dateString{    NSTimeInterval timeInterval = [self getTimeIntervalWithDateString:dateString];        return [self getDateComponentsWithTimeInterval:timeInterval];}+ (NSDateComponents *)getDateComponentsWithTimeInterval:(NSTimeInterval)timeInterval{    NSDate *date = [NSDate dateWithTimeIntervalSince1970:timeInterval];    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];    NSCalendarUnit unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitWeekday | NSCalendarUnitWeekOfMonth  | NSCalendarUnitWeekOfYear | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;    NSDateComponents *components = [calendar components:unitFlags fromDate:date];        return components;}

    NSDateComponents *components = [StringHelper getDateComponentsWithDateString:@"2016-09-12 12:56:10"];    LOG(@"%@", components);        components = [StringHelper getDateComponentsWithDateString:@"2016-09-11 12:56:10"];    LOG(@"%@", components);    components = [StringHelper getDateComponentsWithDateString:@"2016-09-10 12:56:10"];    LOG(@"%@", components);

2016-09-12 13:02:12.283 base[14229:1700476] <NSDateComponents: 0x7fb0f9570770>    Calendar Year: 2016    Month: 9    Leap month: no    Day: 12    Hour: 12    Minute: 56    Second: 10    Week of Year: 38    Week of Month: 3    Weekday: 22016-09-12 13:02:15.600 base[14229:1700476] <NSDateComponents: 0x7fb0f961e760>    Calendar Year: 2016    Month: 9    Leap month: no    Day: 11    Hour: 12    Minute: 56    Second: 10    Week of Year: 38    Week of Month: 3    Weekday: 12016-09-12 13:02:15.601 base[14229:1700476] <NSDateComponents: 0x7fb0f94b6620>    Calendar Year: 2016    Month: 9    Leap month: no    Day: 10    Hour: 12    Minute: 56    Second: 10    Week of Year: 37    Week of Month: 2    Weekday: 7

需要注意的是，Weekday“一”為“周日”，“七”為“周六”，詳情可以查看《聖經 創世紀》；Week of Month表示本月第幾周；Week of Year表示今年第幾周。

7.getDeviceVersion方法更新了iPhone 7和iPhone 7 Plus的裝置版本判斷，詳情參考：https://www.theiphonewiki.com/wiki/Models

8.隨便一提，如果在新增的NSObject類中，無法使用CGFloat、CGPoint之類的類型，是因為沒有引用這些類型所在的標頭檔，在先行編譯標頭檔中引用即可：#import <UIKit/UIKit.h>

 

base項目已更新：git@github.com:ALongWay/base.git