记录字符串的处理,不是一个简单的工作。
NSString是代码中随处可见的类型,也是应用和处理繁多的对象,在此只记录需要常备的方法,并且加以说明。
#pragma mark -- 【计算字符串尺寸+ (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 -- 】计算字符串尺寸#pragma mark -- 【生成属性字符串+ (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 -- 】生成属性字符串#pragma mark -- 【处理时间字符串+ (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 -- 】处理时间字符串#pragma mark -- 【处理网络请求相关字符串+ (NSString *)getSafeDecodeStringFromJsonValue:(NSString *)jsonValue;/** * 被解析的url字符串格式为:xxxxxx?a=xxx&b=xxx * * @param urlString urlString description * * @return return value description */+ (NSDictionary *)getParametersDictionaryWithUrlString:(NSString *)urlString;/** * 被解析的url字符串格式为: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字符串格式为:xxxxxx/realname_320x640.png(/jpg) * * @param originalUrlString originalUrlString description * @param newWidth newWidth description * * @return 在原urlString后增加类似"?act=resize&x=320",用于服务器裁剪尺寸 */+ (NSString *)getImageResizedUrlStringWithOriginalUrlString:(NSString *)originalUrlString newWidth:(NSInteger)newWidth;#pragma mark -- 】处理网络请求相关字符串#pragma mark -- 其他功能方法/** * 获取字符串的字节长度(一个汉字占两个字节长度) * * @param string string description * * @return return value description */+ (NSInteger)getBytesLengthWithString:(NSString *)string;/** * 验证手机号是否合理 * * @param phoneNum phoneNum description * * @return return value description */+ (BOOL)isValidatedMobliePhoneNum:(NSString *)phoneNum;+ (void)printAllCurrentSupportedFonts;+ (NSString *)getDeviceVersion;+ (NSString *)getAppShortVersion;+ (NSString *)getAppBundleVersion;
说明:
1.计算字符串尺寸的方法,sizeWithFont系列方法已经被废物,建议改为boundingRectWithSize方法;NSAttributedString也有boundingRectWithSize方法,如果已知属性字符串可以直接使用。请查看UIKit/NSStringDrawing.h中NSString和NSAttributedString的扩展方法
+ (CGSize)getStringSizeWith:(NSString *)string attributes:(NSDictionary *)attributes{ CGSize size = [string boundingRectWithSize:CGSizeMake(MAXFLOAT, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil].size; return size;}
3.生成属性字符串的方法中,NSMutableParagraphStyle的对象用于设置段落属性(行高、行间距、段落间距、对齐、书写方向、首行缩进、行首缩进、行尾缩进),请查看UIKit/NSParagraphStyle.h
+ (NSAttributedString *)getAttributedStringWithString:(NSString *)string font:(UIFont *)font color:(UIColor *)color lineHeight:(CGFloat)lineHeight maxWidth:(CGFloat)maxWidth{ CGFloat perLineHeight = [StringHelper getStringSizeWith:@"内容" font:font].height; CGFloat lineSpacing = (lineHeight - perLineHeight)/2.5;//2.5是在实际应用中,调校的值 perLineHeight = lineHeight - lineSpacing; //设置文字段落 NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; paragraphStyle.lineHeightMultiple = perLineHeight; paragraphStyle.maximumLineHeight = perLineHeight; paragraphStyle.minimumLineHeight = perLineHeight; paragraphStyle.lineBreakMode = commonLineBreakMode; paragraphStyle.lineSpacing = lineSpacing;//行间距 paragraphStyle.paragraphSpacing = 0;//段间距 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为NSAttributedString常用属性键值,更多查看UIKit/NSAttributedString.h
5.转换时间字符串,需要记录一下常用时间格式占位字符:
#pragma mark -- 时间格式占位符//G: 公元时代,例如AD公元//yy: 年的后2位//yyyy: 完整年//MM: 月,显示为1-12,带前置0//MMM: 月,显示为英文月份简写,如 Jan//MMMM: 月,显示为英文月份全称,如 Janualy//dd: 日,2位数表示,如02//d: 日,1-2位显示,如2,无前置0//EEE: 简写星期几,如Sun//EEEE: 全写星期几,如Sunday//aa: 上下午,AM/PM//H: 时,24小时制,0-23//HH: 时,24小时制,带前置0//h: 时,12小时制,无前置0//hh: 时,12小时制,带前置0//m: 分,1-2位//mm: 分,2位,带前置0//s: 秒,1-2位//ss: 秒,2位,带前置0//S: 毫秒//Z: GMT(时区)
+ (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方法用于得到日期组成对象,实现代码、测试代码、输入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”为“周日”,“七”为“周六”,详情可以查看《圣经 创世纪》;Week of Month表示本月第几周;Week of Year表示今年第几周。
7.getDeviceVersion方法更新了iPhone 7和iPhone 7 Plus的设备版本判断,详情参考:https://www.theiphonewiki.com/wiki/Models
8.随便一提,如果在新增的NSObject类中,无法使用CGFloat、CGPoint之类的类型,是因为没有引用这些类型所在的头文件,在预编译头文件中引用即可:#import <UIKit/UIKit.h>
base项目已更新:git@github.com:ALongWay/base.git
原标题:App开发流程之字符串处理工具类
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