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: 2 2016-09-12 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: 1 2016-09-12 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”,按照西方习俗;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