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让时间不再随系统设置而改变

为 NSString 写了一个类别, 把时间戳输出时间格式

 1 + (NSString *)timeByTimestamp:(NSTimeInterval)timestamp {
 2     
 3     
 4     NSTimeZone *zone = [NSTimeZone defaultTimeZone];
 5     
 6     static NSDateFormatter *formatter =nil;
 7     static dispatch_once_t onceToken;
 8     dispatch_once(&onceToken, ^{
 9         formatter = [[NSDateFormatter alloc] init];
10     });
11     formatter.locale=[[NSLocale alloc]initWithLocaleIdentifier:@"en_US"];
12     [formatter setDateFormat:@"yyyy-MM-dd aa hh:mm"];
13     [formatter setTimeZone:zone];
14     
15     CGFloat thatTime = timestamp;
16     NSDate *thatDate = [NSDate dateWithTimeIntervalSince1970:thatTime];
17     NSString *thatString = [formatter stringFromDate:thatDate];
18     NSDate *nowDate = [NSDate date];
19     CGFloat nowTime = [nowDate timeIntervalSince1970];
20     
21     CGFloat spaceTime = nowTime - thatTime;
22     
23     if (spaceTime / 60 < 5) {
24         return @"刚刚";
25     } else if (spaceTime < 60 * 60 * 24) {
26         NSString *time = [thatString substringFromIndex:11];
27         if ([time hasPrefix:@"PM"]) {
28             time = [time stringByReplacingOccurrencesOfString:@"PM" withString:@"下午"];
29         }
30         if ([time hasPrefix:@"AM"]) {
31             time = [time stringByReplacingOccurrencesOfString:@"AM" withString:@"上午"];
32         }
33         return time;
34     } else if (spaceTime < 60 * 60 * 24 * 2) {
35         NSString *time = [thatString substringFromIndex:11];
36         if ([time hasPrefix:@"PM"]) {
37             time = [time stringByReplacingOccurrencesOfString:@"PM" withString:@"昨天下午"];
38         }
39         if ([time hasPrefix:@"AM"]) {
40             time = [time stringByReplacingOccurrencesOfString:@"AM" withString:@"昨天上午"];
41         }
42         return time;
43     } else if (spaceTime < 60 * 60 * 24 * 3) {
44         NSString *time = [thatString substringFromIndex:11];
45         if ([time hasPrefix:@"PM"]) {
46             time = [time stringByReplacingOccurrencesOfString:@"PM" withString:@"前天下午"];
47         }
48         if ([time hasPrefix:@"AM"]) {
49             time = [time stringByReplacingOccurrencesOfString:@"AM" withString:@"前天上午"];
50         }
51         return time;
52     } else if (spaceTime < 60 * 60 * 24 * 4) {
53         NSString *time = [thatString substringFromIndex:11];
54         if ([time hasPrefix:@"PM"]) {
55             time = [time stringByReplacingOccurrencesOfString:@"PM" withString:@"大前天下午"];
56         }
57         if ([time hasPrefix:@"AM"]) {
58             time = [time stringByReplacingOccurrencesOfString:@"AM" withString:@"大前天上午"];
59         }
60         return time;
61     } else if (spaceTime < 60 * 60 * 24 * 365) {
62         NSDateFormatter *dateFor = [[NSDateFormatter alloc] init];
63         [dateFor setDateFormat:@"M月d日 aa h:mm"];
64         [dateFor setTimeZone:zone];
65         NSString *time = [dateFor stringFromDate:thatDate];
66         time = [time stringByReplacingOccurrencesOfString:@"PM" withString:@"下午"];
67         time = [time stringByReplacingOccurrencesOfString:@"AM" withString:@"上午"];
68         return time;
69     } else {
70         NSDateFormatter *dateFor = [[NSDateFormatter alloc] init];
71         [dateFor setDateFormat:@"yyyy年M月d日 aa h:mm"];
72         [dateFor setTimeZone:zone];
73         NSString *time = [dateFor stringFromDate:thatDate];
74         time = [time stringByReplacingOccurrencesOfString:@"PM" withString:@"下午"];
75         time = [time stringByReplacingOccurrencesOfString:@"AM" withString:@"上午"];
76         return time;
77     }
78 }

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原文地址：https://www.cnblogs.com/shenhongbang/p/4547558.html