字符串截取、替换、修饰
1 /* To avoid breaking up character sequences such as Emoji, you can do: 2 [str substringFromIndex:[str rangeOfComposedCharacterSequenceAtIndex:index].location] 3 [str substringToIndex:NSMaxRange([str rangeOfComposedCharacterSequenceAtIndex:index])] 4 [str substringWithRange:[str rangeOfComposedCharacterSequencesForRange:range] 5 */ 6 - (NSString *)substringFromIndex:(NSUInteger)from; 7 - (NSString *)substringToIndex:(NSUInteger)to; 8 - (NSString *)substringWithRange:(NSRange)range; // Use with rangeOfComposedCharacterSequencesForRange: to avoid breaking up character sequences
1、通过下标获取字符串
OC
1 NSString * str = @"12345abcde"; 2 NSString *logStr = [str substringFromIndex:6]; //从字符串下标为 6 的开始，截止字符串末尾
1 NSString * str = @"12345abcde"; 2 NSString *logStr = [str substringToIndex:3]; //从字符串开始，截止字符串下标为 3
1 /** 2 typedef struct _NSRange { 3 NSUInteger location; 4 NSUInteger length; 5 } NSRange; 6 7 typedef NSRange *NSRangePointer; 8 9 NS_INLINE NSRange NSMakeRange(NSUInteger loc, NSUInteger len) { 10 NSRange r; 11 r.location = loc; 12 r.length = len; 13 return r; 14 } 15 */ 16 17 NSString * str = @"12345abcde"; 18 NSString *logStr = [str substringWithRange:NSMakeRange(2, 4)]; //从下标为2开始，截取长度为4的字符串
JS
var str = "这是一个很长的字符串" console.log(str.substring(0, 3)) //输出 这是一
2、匹配查找字符串
1 NSString * str = @"12345abcde"; 2 NSRange *logRange = [str rangeOfString:@"ab"]; //返回匹配到字符串的起始下标及长度
3、分割字符串
OC
1 NSString * str = @"12345abcde"; 2 NSArray *logArr = [str componentsSeparatedByString:@"a"]; //以a为分隔符，返回分割后的字符串数组 3 //数组元素拼接为字符串 4 NSString *toStr = [logArr componentsJoinedByString:@","]; 5 //toStr 12345,bcde
Swift
let urlScheme = "baidumap://map/walknavi?origin=40.057406655722,116.2964407172&destination=39.91441,116.40405"
let strArr = urlScheme.components(separatedBy: "://")
print(strArr) //输出：[baidumap,map/walknavi?origin=40.057406655722,116.2964407172&destination=39.91441,116.40405]
4、字符串替换
OC
NSString *str = @"18888888888"; NSString *logString = [str stringByReplacingCharactersInRange:NSMakeRange(3, 4) withString:@"****"]; //隐藏手机号中间四位数 NSLog(@"%@",logString);//输出结果为188****8888
NSString *content = @"1&2&3&4&5&6";
NSString *replaceStr = [content stringByReplacingOccurrencesOfString:@"&" withString:@","];//用 , 替换 &
DebugLog(@"结果：%@",replaceStr);//输出结果 1,2,3,4,5,6
Swift
let content = "1&2&3&4&5&6" let replaceStr = content.replacingOccurrences(of:"&", with:",") print(replaceStr) // 输出:1,2,3,4,5,6
5、字符串大小写转换
/** /* The following three return the canonical (non-localized) mappings. They are suitable for programming operations that require stable results not depending on the user's locale preference. For locale-aware case mapping for strings presented to users, use the "localized" methods below. */ @property (readonly, copy) NSString *uppercaseString; @property (readonly, copy) NSString *lowercaseString; @property (readonly, copy) NSString *capitalizedString; */ NSString *str1 = @"abcdef123"; NSString *str2 = @"QWER456"; //字符串的英文字符由小写转换成大写 NSString *bigStr = [str1 uppercaseString]; NSLog(@"%@",bigStr); //输出结果为 ABCDEF123 //字符串的英文字符由大写转换为小写 NSString *smallStr = [str2 lowercaseString]; NSLog(@"%@",smallStr);//输出结果为 qwer456 //字符串的首字母改为大写 NSString *FirstletterbiggerStr = [str1 capitalizedString]; NSLog(@"%@",FirstletterbiggerStr);//输出结果为Abcdef123
6、字符串部分上色、修改样式
1 NSString *Str = @"我自愿加入原创者联盟"; 2 NSMutableAttributedString *MutableStr = [[NSMutableAttributedString alloc] initWithString:Str]; 3 [MutableStr addAttribute:NSForegroundColorAttributeName value:[UIColor grayColor] range:NSMakeRange(0, 5)]; 4 //同样如果是改变字符串中某段字体的大小可以这样写： 5 [MutableStr addAttribute:NSFontAttributeName value:[UIFont SystemFontOfSize:28] range:NSMakeRange(5, 5)];
