iphone 的NSString NSMutableString的用法

1、初始化字符串一

[[NSString alloc] initWithFormat:@"%d",10];

2、初始化字符串二

[[NSString alloc] initWithCString:@"字符串内容"]

3、字符串的替换注：将字符串中的参数进行替换参数1：目标替换值参数2：替换成为的值参数3：类型为默认：NSLiteralSearch参数4：替换的范围

[str replaceOccurrencesOfString:@"1" withString:@"222" options:NSLiteralSearch range:NSMakeRange(0, [str length])];

4、给字符串分配容量

NSMutableString *String; String = [NSMutableString stringWithCapacity:40];

5、追加字符串

NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"]; [String1 appendFormat:[NSString stringWithFormat:@", I will be adding some character"]];

6、在已有字符串中按照所给出范围和长度删除字符

NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"]; [String1 deleteCharactersInRange:NSMakeRange(0, 5)];

7、在已有字符串后面在所指定的位置中插入给出的字符串

NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"]; [String1 insertString:@"Hi! " atIndex:0];

8、按照所给出的范围，和字符串替换的原有的字符

NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"]; [String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];

9、判断字符串内是否还包含别的字符串(前缀，后缀)

NSString *String1 = @"NSStringInformation.txt"; [String1 hasPrefix:@"NSString"] = = 1 ? NSLog(@"YES") : NSLog(@"NO"); [String1 hasSuffix:@".txt"] = = 1 ? NSLog(@"YES") : NSLog(@"NO");

10、返回一个数组，包含从已经由一个给定的分隔符分为接收器串。- （NSArray*）componentsSeparatedByString：（NSString*）NString参数
分离器
分隔符的字符串。

NSString *list = @"Norman, Stanley, Fletcher"; NSArray *listItems = [list componentsSeparatedByString:@", "]; listItems包含了：{ @"Norman", @"Stanley", @"Fletcher" }.

11、是否包含该字符串

NSRange range = [@"字符串--A" rangeOfString:“是否包含--B”]; if (range.location == NSNotFound){//不包含}else{//包含}