IOS开发之字符串处理

来源:互联网 发布:linux u盘启动盘 编辑:程序博客网 时间:2024/03/29 22:07
取字符串的第一个字符:
NSString *string1 = @"8232223333";
 NSString *firstNumber = [string1 substringToIndex:1];

用“&”分割字符串,分割后成为一个数组;
NSString *string1 = @"82322&23333";
NSArray *array = [str componentsSeparatedByString:@"&"];
NSString *string2 = [array objectAtIndex:0];  (取“&”前的字符串)

根据指定起始位置及长度,截取字符串;
NSString *string1 = @"76547653876421";
NSString *string2 = [idNumber substringWithRange:NSMakeRange(0, 5)];

去掉字符串前后空格
NSString *string1 = @" 999999665 00543 ";
    NSString *string2 = [string1 stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

请求接口时,如果有中文字符需要做字符串转码:
NSString *string2 = [string1 stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

在string后面添加字符“,”
 NSMutableString* mutableString=[[NSMutableString alloc] init];
[mutableString appendString:[NSString stringWithFormat:@"%@,",string]];

判断两个字符串是否相同:
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!"
BOOL result = [astring01 compare:astring02] == NSOrderedSame;
查找字符串是否包含其它字符串:NSString *string1 = @"This is a string";NSString *string2 = @"string";NSRange range = [string1 rangeOfString:string2];
-substringToIndex: 从字符串的开头一直截取到指定的位置,但不包括该位置的字符:
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringToIndex:3];

-substringFromIndex: 以指定位置开始(包括指定位置的字符),并包括之后的全部字符
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringFromIndex:3];

-replaceCharactersInRangewithString: //用指定字符串替换字符串中某指定位置、长度的字符串NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];[String1 replaceCharactersInRange:NSMakeRange(04) withString:@"That"];

-insertString: atIndex: //在指定位置插入字符串
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];[String1 insertString:@"Hi! " atIndex:0];
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