OC常用函数简单介绍——NSMutableString

1.NSMutableString的初始化

//1.与NSString初始化方法类似

NSMutableString *a1 = [NSMutableString stringWithFormat:@"%d",0];

NSMutableString *a2 = [NSMutableString stringWithUTF8String:"0"];

//2.可变空字符串初始化

NSMutableString *b = [NSMutableString string];

//3.不可变字符串变可变字符串

NSString *c1 = @"123";

NSMutableString *c2 = [NSMutableString stringWithString:c1];

//还可以写成

NSMutableString *c3 = [c1 mutableCopy];

 

2.NSMutableString的常用方法

//1.追加字符串

NSMutableString *str = [NSMutableString string];

[str appendString:[NSString stringWithFormat:@"%d",123]];

//2.追加新的格式化字符串

[str2 appendFormat:@"%d",456];

//3.删除方法（Range(x,y)  x是从第几位开始删除，y是一共删除几位）

[str deleteCharactersInRange:NSMakeRange(0, 5)];

//4.插入字符（index值为在第几位上插入字符）

[str insertString:@"aaa" atIndex:0];

//5.替换字符串(Range(x,y) x是从第几位开始替换，y是一共替换几位)

[str replaceCharactersInRange:NSMakeRange(0, 3) withString:@"bbb"];

 

转载于:https://my.oschina.net/DerrickLiu/blog/744203