026-Catagory-NSString

#import 
#import 

@interface NSString (JFMessage)

/**
 *  返回聊天信息文本的宽高
 */
+ (CGSize)sizeWithString:(NSString*)str andFont:(UIFont*)font andMaxSize:(CGSize)size;

/**
 *  将毫秒转换成日期
 */
+ (NSString *)getShowDateWithTime:(NSString *)time;

@end

#import "NSString+JFString.h"

@implementation NSString (JFMessage)

+ (CGSize)sizeWithString:(NSString*)str andFont:(UIFont*)font andMaxSize:(CGSize)size {
    NSDictionary*attrs =@{NSFontAttributeName: font};
    return [str boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:attrs  context:nil].size;
}

+ (NSString *)getShowDateWithTime:(NSString *)time {
    /**
     传入时间转NSDate类型
     */
    NSDate *timeDate = [[NSDate alloc]initWithTimeIntervalSince1970:[time longLongValue]/1000.0];
    
    /**
     初始化并定义Formatter
     
     :returns: NSDate
     */
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm";
    
    /**
     *  使用Formatter格式化时间（传入时间和当前时间）为NSString
     */
    NSString *timeStr = [dateFormatter stringFromDate:timeDate];
    NSString *nowDateStr = [dateFormatter stringFromDate:[NSDate date]];
    
    /**
     *  判断前四位是不是本年，不是本年直接返回完整时间
     */
    if ([[timeStr substringWithRange:NSMakeRange(0, 4)] rangeOfString:[nowDateStr substringWithRange:NSMakeRange(0, 4)]].location == NSNotFound) {
        return timeStr;
    }else{
        /**
         *  判断是不是本天，是本天返回HH:mm,不是返回MM-dd HH:mm
         */
        if ([[timeStr substringWithRange:NSMakeRange(5, 5)] rangeOfString:[nowDateStr substringWithRange:NSMakeRange(5, 5)]].location != NSNotFound) {
            return [timeStr substringWithRange:NSMakeRange(11, 5)];
        }else{
            return [timeStr substringWithRange:NSMakeRange(5, 11)];
        }
    }
}

@end