- (void)test20 {
//逆序
NSString *temp = @"abcdefg";
NSMutableArray *characters = @[].mutableCopy;
for (int i = temp.length - 1; i >= 0; i--) {
unichar c = [temp characterAtIndex:i];
NSString *ch = [NSString stringWithCharacters:&c length:1];
[characters addObject:ch];
}
NSString *result = [characters componentsJoinedByString:@""];
NSLog(@"%@",result);
for (NSString *ch in characters) {
NSLog(@"%@",ch);
}
}
- (void)test19 {
NSString *temp = @"abcdefg";
//转大写
[temp uppercaseString];
//转小写
[temp lowercaseString];
}
- (void)test18 {
//在string最后拼接字符或者字符串
NSString *tempstr = @"/Users/lihe/Desktop/temp.";
NSString *result = [tempstr stringByPaddingToLength:tempstr.length + 5 withString:@"plist" startingAtIndex:0];
NSLog(@"%@",result);
}
//URL编码通常也被称为百分号编码(Url Encoding,also known as percent-encoding)
#pragma mark -----得到fullPath ---------------
- (void)test17 {
//扩展文件路径
NSString *tempstr = @"~user";
NSString *result = [tempstr stringByExpandingTildeInPath];
NSLog(@"%@",result);
}
#pragma mark -----字符串删除 ---------------
- (void)test16 {
//删除后缀
NSString *tempstr = @"/Users/lihe/Desktop/temp.plist";
NSString *result = [tempstr stringByDeletingPathExtension];
NSLog(@"%@",result);
}
- (void)test15 {
//删除最后的文件名加后缀
NSString *tempstr = @"/Users/lihe/Desktop/temp.plist";
NSString *result = [tempstr stringByDeletingLastPathComponent];
NSLog(@"%@",result);
}
#pragma mark -----数组拼接 ---------------
- (void)test14 {
NSArray *stringArr = @[@"dd",@"ee",@"ff"];
NSArray *sortedArr = [stringArr sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
return obj1 < obj2;
}];
NSString *joinString = [sortedArr componentsJoinedByString:@"-"];
NSLog(@"%@",joinString);
}
#pragma mark -----比较字符串 ---------------
- (void)test13 {
//字符串比较
NSString *tempstr0 = @"aa";
NSString *tempstr1 = @"bb";
NSComparisonResult resut = [tempstr0 compare:tempstr1];
if (resut == NSOrderedSame) {
NSLog(@"相等");
}else if(resut == NSOrderedAscending){
NSLog(@"%@",@"升序");
}else if (resut == NSOrderedDescending){
NSLog(@"降序");
}
}
#pragma mark -----字符串查找 ---------------
- (void)test12 {
NSString *tempstr = @"aa-bb-cc";
//当查找不到的时候,需要处理一下
NSRange range = [tempstr rangeOfString:@"+"];
if (range.length == 0) {
NSLog(@"没找到");
return;
}
NSLog(@"%@",NSStringFromRange(range));
unichar c = [tempstr characterAtIndex:range.location];
NSLog(@"%c",c);
}
- (void)test11 {
NSString *tempstr = @"aa-bb-cc";
NSString *subStr0 = [tempstr substringFromIndex:0];
NSLog(@"%@",subStr0);
NSString *subStr1 = [tempstr substringToIndex:tempstr.length - 1];
NSLog(@"%@",subStr1);
NSString *subStr2 = [tempstr substringWithRange:NSMakeRange(0, tempstr.length)];
NSLog(@"%@",subStr2);
}
- (void)test10 {
//字符串查找
NSString *tempstr = @"aa-bb-cc";
BOOL iscontain = [tempstr containsString:@"bb"];
NSLog(@"%zd",iscontain);
}
#pragma mark -----字符串拼接---------------
- (void)test9 {
//从数组中取元素拼接
NSString *tempstr = @"aa-bb-cc";
NSArray *stringArr = @[@"dd",@"ee",@"ff"];
NSArray *append = [tempstr stringsByAppendingPaths:stringArr];
NSLog(@"%@",append);
}
- (void)test8 {
//格式化拼接
NSString *tempstr = @"/Users/lihe/Desktop/temp";
NSString *append = [tempstr stringByAppendingFormat:@"%zd",888];
NSLog(@"%@",append);
}
- (void)test7 {
//文件扩展
NSString *tempstr = @"/Users/lihe/Desktop/temp";
NSString *pathExtension = [tempstr stringByAppendingPathExtension:@".plist"];
NSLog(@"%@",pathExtension);
}
- (void)test6 {
//路径拼接
NSString *tempstr = @"/Users/lihe/Desktop/";
NSString *pahtComponet = [tempstr stringByAppendingPathComponent:@"niubi.plist"];
NSLog(@"%@",pahtComponet);
}
- (void)test5 {
NSString *tempstr = @"aa-bb-cc";
NSString *append = [tempstr stringByAppendingString:@"gold is a girl"];
NSLog(@"%@",append);
}
#pragma mark -----字符串替换 ---------------
- (void)test4 {
//字符串替换
NSString *tempstr = @"aa-bb-cc";
NSRange range = [tempstr rangeOfString:@"bb" options:NSLiteralSearch];
NSString *replace = [tempstr stringByReplacingCharactersInRange:range withString:@"oh"];
NSLog(@"%@",replace);
}
- (void)test3 {
//字符串替换
NSString *tempstr = @"aa-bb-cc";
NSRange range = NSMakeRange(0, tempstr.length);
NSString *arr = [tempstr stringByReplacingOccurrencesOfString:@"-" withString:@"=" options:NSCaseInsensitiveSearch range:range];
NSLog(@"%@",arr);
}
- (void)test2 {
//字符串替换
NSString *tempstr = @"aa-bb-cc";
NSString *replacestr = [tempstr stringByReplacingOccurrencesOfString:@"-" withString:@"+"];
NSLog(@"%@",replacestr);
}
#pragma mark -----字符串切割 ---------------
- (void)test01 {
//删除两端的字符
NSString *tempstr = @"+aa-bb-cc-";
NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@"-+"];
NSString *trim = [tempstr stringByTrimmingCharactersInSet:set];
NSLog(@"%@",trim);
}
- (void)test1 {
//按照characterSet中的字符来切割
//NSCharacterSet有很多属性,空格键,control键,等
NSString *tempstr = @"a,a-b,b,c,c-d";
NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@",-"];
NSArray *arr = [tempstr componentsSeparatedByCharactersInSet:set];
NSLog(@"%@",arr);
}
- (void)test0 {
//字符串切割
NSString *tempstr = @"aa-bb-cc";
NSArray *arr = [tempstr componentsSeparatedByString:@"-"];
NSLog(@"%@",arr);
}
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