1.NSMutableString常用方法
- - (void)appendString:(NSString *)aString;
NSMutableString *strM = [NSMutableString string];
NSLog(@"strM = %@", strM);
[strM appendString:@"lnj"];
NSLog(@"strM = %@", strM);
- - (void)appendFormat:(NSString *)format, ...;
NSMutableString *strM = [NSMutableString string];
[strM appendFormat:@"/age is %i", 10];
- - (void)deleteCharactersInRange:(NSRange)range;
NSMutableString *strM = [NSMutableString stringWithString:@"http://www.520it.com"];
// 一般情况下利用rangeOfString和deleteCharactersInRange配合删除指定内容
NSRange range = [strM rangeOfString:@"http://"];
[strM deleteCharactersInRange:range];
NSLog(@"strM = %@", strM);
- - (void)insertString:(NSString *)aString atIndex:(NSUInteger)loc;
NSMutableString *strM = [NSMutableString stringWithString:@"www.520it.com"];
[strM insertString:@"http://" atIndex:0];
NSLog(@"strM = %@", strM);
- - (void)replaceCharactersInRange:(NSRange)range withString:(NSString *)aString;
NSMutableString *strM = [NSMutableString stringWithString:@"http://www.520it.com/lnj.png"];
NSRange range = [strM rangeOfString:@"lnj"];
[strM replaceOccurrencesOfString:@"lnj" withString:@"jjj" options:0 range:range];
NSLog(@"strM = %@", strM);
2.字符串使用注意事项
- @”lnj”这种方式创建的字符串始终是NSString,不是NSMutalbeString.所以下面的代码创建的还是NSString,此时使用可变字符串的函数,无法操作字符串。
NSMutalbeString *s1 = @”lnj”;
// 会报错
[strM insertString:@"my name is " atIndex:0];