字符串反转
第一种：
- (NSString *)reverseWordsInString:(NSString *)str
{
NSMutableString *newString = [[NSMutableString alloc] initWithCapacity:str.length];
for (NSInteger i = str.length - 1; i >= 0 ; i --)
{
unichar ch = [str characterAtIndex:i];
[newString appendFormat:@"%c", ch];
}
return newString;
}
//第二种：
- (NSString*)reverseWordsInString:(NSString*)str
{
NSMutableString *reverString = [NSMutableString stringWithCapacity:str.length];
[str enumerateSubstringsInRange:NSMakeRange(0, str.length) options:NSStringEnumerationReverse | NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
[reverString appendString:substring];
}];
return reverString;
}
iOS 获取汉字的拼音
+ (NSString *)transform:(NSString *)chinese
{
//将NSString装换成NSMutableString
NSMutableString *pinyin = [chinese mutableCopy];
//将汉字转换为拼音(带音标)
CFStringTransform((__bridge CFMutableStringRef)pinyin, NULL, kCFStringTransformMandarinLatin, NO);
NSLog(@"%@", pinyin);
//去掉拼音的音标
CFStringTransform((__bridge CFMutableStringRef)pinyin, NULL, kCFStringTransformStripCombiningMarks, NO);
NSLog(@"%@", pinyin);
//返回最近结果
return pinyin;
}
G: 公元时代，例如AD公元
yy: 年的后2位
yyyy: 完整年
MM: 月，显示为1-12
MMM: 月，显示为英文月份简写,如 Jan
MMMM: 月，显示为英文月份全称，如 Janualy
dd: 日，2位数表示，如02
d: 日，1-2位显示，如 2
EEE: 简写星期几，如Sun
EEEE: 全写星期几，如Sunday
aa: 上下午，AM/PM
H: 时，24小时制，0-23
K：时，12小时制，0-11
m: 分，1-2位
mm: 分，2位
s: 秒，1-2位
ss: 秒，2位
S: 毫秒
阿拉伯数字转中文格式
+(NSString *)translation:(NSString *)arebic
{
NSString *str = arebic;
NSArray *arabic_numerals = @[@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"0"];
NSArray *chinese_numerals = @[@"一",@"二",@"三",@"四",@"五",@"六",@"七",@"八",@"九",@"零"];
NSArray *digits = @[@"个",@"十",@"百",@"千",@"万",@"十",@"百",@"千",@"亿",@"十",@"百",@"千",@"兆"];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:chinese_numerals forKeys:arabic_numerals];
NSMutableArray *sums = [NSMutableArray array];
for (int i = 0; i < str.length; i ++) {
NSString *substr = [str substringWithRange:NSMakeRange(i, 1)];
NSString *a = [dictionary objectForKey:substr];
NSString *b = digits[str.length -i-1];
NSString *sum = [a stringByAppendingString:b];
if ([a isEqualToString:chinese_numerals[9]])
{
if([b isEqualToString:digits[4]] || [b isEqualToString:digits[8]])
{
sum = b;
if ([[sums lastObject] isEqualToString:chinese_numerals[9]])
{
[sums removeLastObject];
}
}else
{
sum = chinese_numerals[9];
}
if ([[sums lastObject] isEqualToString:sum])
{
continue;
}
}
[sums addObject:sum];
}
NSString *sumStr = [sums componentsJoinedByString:@""];
NSString *chinese = [sumStr substringToIndex:sumStr.length-1];
NSLog(@"%@",str);
NSLog(@"%@",chinese);
return chinese;
}
获取手机安装的应用
Class c =NSClassFromString(@"LSApplicationWorkspace");
id s = [(id)c performSelector:NSSelectorFromString(@"defaultWorkspace")];
NSArray *array = [s performSelector:NSSelectorFromString(@"allInstalledApplications")];
for (id item in array)
{
NSLog(@"%@",[item performSelector:NSSelectorFromString(@"applicationIdentifier")]);
//NSLog(@"%@",[item performSelector:NSSelectorFromString(@"bundleIdentifier")]);
NSLog(@"%@",[item performSelector:NSSelectorFromString(@"bundleVersion")]);
NSLog(@"%@",[item performSelector:NSSelectorFromString(@"shortVersionString")]);
}
iOS-身份证中间数字设置为星号
- (NSString*)replaceStringWithAsterisk:(NSInteger)startLocation length:(NSInteger)length {
NSString*replaceStr =self;
for(NSIntegeri =0; i < length; i++) {
NSRangerange =NSMakeRange(startLocation,1);
replaceStr = [replaceStr stringByReplacingCharactersInRange:range withString:@"*"];
startLocation ++;
}
returnreplaceStr;
}
NSString转char类型数组
unsignedcharcss[aaa.length];
memcpy(css, [aaa cStringUsingEncoding:NSUTF8StringEncoding], aaa.length);
for(inti =0; i <sizeof(css); i++) {
NSLog(@"%d======%c",i,css[i]);
}
char数组转NSString，这里就直接遍历拼接
NSMutableString*mustr = [NSMutableStringstring];
for(inti =0; i <sizeof(css); i++) {
[mustr appendFormat:@"%c",css[i] ];
}
NSLog(@"%@",mustr);
0.按范围截取字符串
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringWithRange:NSMakeRange(0, 4)]; //从0位开始截取4个的长度
1.截取字符串
NSString*string =@"sdfsfsfsAdfsdf";
string = [string substringToIndex:7];//截取前七位字符 (第七位不算在内)
[string substringFromIndex:2];//字符串从第2位开始截取 (包含第二位)
2.替换字符串
NSString *strUrl = [urlString stringByReplacingOccurrencesOfString:@"我要被替换了" withString:@"我来替换你"];
3.中文字符串转UTF8
NSString *strB = [@"中国"stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
4.将NSData和字符串
//将NSData转化为NSString
NSString* str = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
//将NSString 转化为NSData (NSString.h)
NSData* data = [str dataUsingEncoding:NSUTF8StringEncoding];
5.从文件读取字符串
NSString *path = @"astring.text";
NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
6.写字符串到文件
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
NSString *path = @"astring.text";
[astring writeToFile: path atomically: YES];
7.字符串中搜索字符串
if ([strArangeOfString:area].location !=NSNotFound) {
//如果strA的内容中包含area那么进入判断
}
8.在需要的位置插入字符串-恩插入
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 insertString:@"Hi! " atIndex:0];
9.切割字符串
NSArray *array = [nstring componentsSeparatedByString:@","];
10.转换 NSURLRequest 或 URL 为字符串
NSURL *url = [requestURL];
NSString *str=[[url absoluteString] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
//你也可以用点属性
NSString *urlStr = request.URL.absoluteString;
11.对比字符串的头
NSString *str1 = @"aaaa://";
NSString *str2 = @"aaaa://aaaa.vvvv.com";
BOOL _is = [str2 hasPrefix:str1];
12数字每隔3位用逗号分隔
/**
价格转换为每隔3位用逗号分割
show 是否显示小数点后面
*/
+ (NSString *)changePriceWithNumber:(float)value showPoint:(BOOL)show {
NSString *valueStr = @"";
NSString *format = @"";
if (show) {
valueStr = [NSString stringWithFormat:@"%.2f", value];
format = @",###.##";
} else {
valueStr = [NSString stringWithFormat:@"%.f", value];
format = @",###";
}
NSDecimalNumber *decNumber = [NSDecimalNumber decimalNumberWithString:valueStr];
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
[numberFormatter setPositiveFormat:format];
return [numberFormatter stringFromNumber:decNumber];
}
网友评论