iOS技术文档No.18 AppKit_NSString(二 常
2017-07-24 本文已影响8人
孤独雪域
NSString过滤特殊字符
// 定义一个特殊字符的集合
NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString: @"@／：；（）¥「」＂、[]{}#%-*+=_\\|~＜＞$€^•'@#$%^&*()_+'\""];
// 过滤字符串的特殊字符
NSString *newString = [trimString stringByTrimmingCharactersInSet:set];
去除所有空格
[str stringByReplacingOccurrencesOfString:@" " withString:@""];
去除收尾的空格
[str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
- (NSString *)uppercaseString; // 全部字符转为大写字母
- (NSString *)lowercaseString;// 全部字符转为小写字母
复制字符串到剪贴板
UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
pasteboard.string = self.label.text;
处理标签字符串中的空格,换行,/t(制表符)等
- (NSString *)replaceStringWithString :(NSMutableString *)string{
NSString *string1 = [string stringByReplacingOccurrencesOfString:@"\n" withString:@""] ;
NSString *string2 = [string1 stringByReplacingOccurrencesOfString:@" " withString:@""] ;
NSString *string3 = [string2 stringByReplacingOccurrencesOfString:@"\r" withString:@""] ;
NSString *string4 = [string3 stringByReplacingOccurrencesOfString:@"\t" withString:@""] ;
return string4 ;
}
UIImage与字符串互转
//字符串转图片
-(UIImage *)Base64StrToUIImage:(NSString *)_encodedImageStr{
NSData *_decodedImageData = [[NSData alloc] initWithBase64Encoding:_encodedImageStr];
UIImage *_decodedImage = [UIImage imageWithData:_decodedImageData];
return _decodedImage;
}
//图片转字符串
-(NSString *)UIImageToBase64Str:(UIImage *) image{
NSData *data = UIImageJPEGRepresentation(image, 1.0f);
NSString *encodedImageStr = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
return encodedImageStr;
}
根据汉字字符串获取该字符串的拼音然后取得首字母
分享资源 汉字转换为 拼音 获取首字母
//获取拼音首字母(传入汉字字符串, 返回大写拼音首字母)/*
- (NSString *)firstCharactor:(NSString *)aString {
//转成了可变字符串
NSMutableString *str = [NSMutableString stringWithString:aString];
//先转换为带声调的拼音
CFStringTransform((CFMutableStringRef)str,NULL, kCFStringTransformMandarinLatin,NO);
//再转换为不带声调的拼音
CFStringTransform((CFMutableStringRef)str,NULL, kCFStringTransformStripDiacritics,NO);
//转化为大写拼音
NSString *pinYin = [str capitalizedString];
//获取并返回首字母
return [pinYin substringToIndex:1];
}
*/
NSString *string = @"简书" ;
if ([string length]){
NSMutableString *mutableString = [NSMutableString stringWithString:string] ;
/** * 由于此方法是在coreFoundation框架下,咱们平时所使用的类型都是Foundation框架下的,所以需要转换类型.
* * @param string#> string 所需要转换的原字符#>
* @param range#> range 所需要转换字符的范围.
如果为0或者是NULL意思是所有字符都转换#>
* @param transform#> transform 转换方式#>
* @param reverse#> reverse 如果为YES,返回原字符串;如果为NO,返回转换之后的字符串#>
* * @return return value description */
// 将所有非英文的字符转换为拉丁字母,并且带声调和重音标识
// __bridge :只改变当前对象的类型,但是不改变对象内存的管理权限
CFStringTransform((__bridge CFMutableStringRef)mutableString , 0,kCFStringTransformToLatin , NO) ;
// 去掉声调
CFStringTransform((__bridge CFMutableStringRef)mutableString , 0,kCFStringTransformStripDiacritics , NO) ;
// 每个单词的首字母大写 后再截取字符串
NSString *str = [[mutableString capitalizedString] substringToIndex:1];}
验证身份证号码
//验证身份证号码
- (BOOL)checkIdentityCardNo:(NSString*)cardNo{
if (cardNo.length != 18) {
return NO;
}
NSArray* codeArray = [NSArray arrayWithObjects:@"7",@"9",@"10",@"5",@"8",@"4",@"2",@"1",@"6",@"3",@"7",@"9",@"10",@"5",@"8",@"4",@"2", nil];
NSDictionary* checkCodeDic = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"1",@"0",@"X",@"9",@"8",@"7",@"6",@"5",@"4",@"3",@"2", nil] forKeys:[NSArray arrayWithObjects:@"0",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10", nil]];
NSScanner* scan = [NSScanner scannerWithString:[cardNo substringToIndex:17]];
int val;
BOOL isNum = [scan scanInt:&val] && [scan isAtEnd];
if (!isNum) {
return NO;
}
int sumValue = 0;
for (int i =0; i<17; i++) {
sumValue+=[[cardNo substringWithRange:NSMakeRange(i , 1) ] intValue]* [[codeArray objectAtIndex:i] intValue];
}
NSString* strlast = [checkCodeDic objectForKey:[NSString stringWithFormat:@"%d",sumValue%11]];
if ([strlast isEqualToString: [[cardNo substringWithRange:NSMakeRange(17, 1)]uppercaseString]]) {
return YES;
}
return NO;
}
判断手机号码格式是否正确
//判断手机号码格式是否正确
+ (BOOL)valiMobile:(NSString *)mobile{
mobile = [mobile stringByReplacingOccurrencesOfString:@" " withString:@""];
if (mobile.length != 11)
{
return NO;
}else{
/**
* 移动号段正则表达式
*/
NSString *CM_NUM = @"^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\\d{8}|(1705)\\d{7}$";
/**
* 联通号段正则表达式
*/
NSString *CU_NUM = @"^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\\d{8}|(1709)\\d{7}$";
/**
* 电信号段正则表达式
*/
NSString *CT_NUM = @"^((133)|(153)|(177)|(18[0,1,9]))\\d{8}$";
NSPredicate *pred1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM_NUM];
BOOL isMatch1 = [pred1 evaluateWithObject:mobile];
NSPredicate *pred2 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU_NUM];
BOOL isMatch2 = [pred2 evaluateWithObject:mobile];
NSPredicate *pred3 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT_NUM];
BOOL isMatch3 = [pred3 evaluateWithObject:mobile];
if (isMatch1 || isMatch2 || isMatch3) {
return YES;
}else{
return NO;
}
}
}
判断邮箱格式是否正确
//利用正则表达式验证
+ (BOOL)isAvailableEmail:(NSString *)email {
NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:email];
}
获取iOS路径的方法
获取家目录路径的函数
NSString *homeDir = NSHomeDirectory();
获取Documents目录路径的方法
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir = [paths objectAtIndex:0];
获取Documents目录路径的方法
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachesDir = [paths objectAtIndex:0];
获取tmp目录路径的方法：
NSString *tmpDir = NSTemporaryDirectory();
获取设备IP地址
需要引入下头文件：
#import <ifaddrs.h>
#import <arpa/inet.h>
代码：
//获取设备 IP 地址
+ (NSString *)getIPAddress {
NSString *address = @"error";
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;
success = getifaddrs(&interfaces);
if (success == 0) {
temp_addr = interfaces;
while(temp_addr != NULL) {
if(temp_addr->ifa_addr->sa_family == AF_INET) {
if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
}
}
temp_addr = temp_addr->ifa_next;
}
}
freeifaddrs(interfaces);
return address;
}
获取WiFi信息
需要引入头文件
#import <SystemConfiguration/CaptiveNetwork.h>
代码：
//获取 WiFi 信息
- (NSDictionary *)fetchSSIDInfo {
NSArray *ifs = (__bridge_transfer NSArray *)CNCopySupportedInterfaces();
if (!ifs) {
return nil;
}
NSDictionary *info = nil;
for (NSString *ifnam in ifs) {
info = (__bridge_transfer NSDictionary *)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
if (info && [info count]) { break; }
}
return info;
}
获取广播地址、本机地址、子网掩码、端口信息
#import <ifaddrs.h>
#import <arpa/inet.h>
//获取广播地址、本机地址、子网掩码、端口信息
- (NSMutableDictionary *)getLocalInfoForCurrentWiFi {
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;
// retrieve the current interfaces - returns 0 on success
success = getifaddrs(&interfaces);
if (success == 0) {
// Loop through linked list of interfaces
temp_addr = interfaces;
//*/
while(temp_addr != NULL) {
if(temp_addr->ifa_addr->sa_family == AF_INET) {
// Check if interface is en0 which is the wifi connection on the iPhone
if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
//广播地址
NSString *broadcast = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_dstaddr)->sin_addr)];
if (broadcast) {
[dict setObject:broadcast forKey:@"broadcast"];
}
// NSLog(@"broadcast address--%@",broadcast);
//本机地址
NSString *localIp = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
if (localIp) {
[dict setObject:localIp forKey:@"localIp"];
}
// NSLog(@"local device ip--%@",localIp);
//子网掩码地址
NSString *netmask = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_netmask)->sin_addr)];
if (netmask) {
[dict setObject:netmask forKey:@"netmask"];
}
// NSLog(@"netmask--%@",netmask);
//--en0 端口地址
NSString *interface = [NSString stringWithUTF8String:temp_addr->ifa_name];
if (interface) {
[dict setObject:interface forKey:@"interface"];
}
// NSLog(@"interface--%@",interface);
return dict;
}
}
temp_addr = temp_addr->ifa_next;
}
}
// Free memory
freeifaddrs(interfaces);
return dict;
}
获取字符串（或汉字）首字母
//获取字符串(或汉字)首字母
+ (NSString *)firstCharacterWithString:(NSString *)string{
NSMutableString *str = [NSMutableString stringWithString:string];
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO);
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
NSString *pingyin = [str capitalizedString];
return [pingyin substringToIndex:1];
}
将字符串数组按照元素首字母顺序进行排序进行排序分组
//将字符串数组按照元素首字母顺序进行排序分组
+ (NSDictionary *)dictionaryOrderByCharacterWithOriginalArray:(NSArray *)array{
if (array.count == 0) {
return nil;
}
for (id obj in array) {
if (![obj isKindOfClass:[NSString class]]) {
return nil;
}
}
UILocalizedIndexedCollation *indexedCollation = [UILocalizedIndexedCollation currentCollation];
NSMutableArray *objects = [NSMutableArray arrayWithCapacity:indexedCollation.sectionTitles.count];
//创建27个分组数组
for (int i = 0; i < indexedCollation.sectionTitles.count; i++) {
NSMutableArray *obj = [NSMutableArray array];
[objects addObject:obj];
}
NSMutableArray *keys = [NSMutableArray arrayWithCapacity:objects.count];
//按字母顺序进行分组
NSInteger lastIndex = -1;
for (int i = 0; i < array.count; i++) {
NSInteger index = [indexedCollation sectionForObject:array[i] collationStringSelector:@selector(uppercaseString)];
[[objects objectAtIndex:index] addObject:array[i]];
lastIndex = index;
}
//去掉空数组
for (int i = 0; i < objects.count; i++) {
NSMutableArray *obj = objects[i];
if (obj.count == 0) {
[objects removeObject:obj];
}
}
//获取索引字母
for (NSMutableArray *obj in objects) {
NSString *str = obj[0];
NSString *key = [self firstCharacterWithString:str];
[keys addObject:key];
}
NSMutableDictionary *dic = [NSMutableDictionary dictionary];
[dic setObject:objects forKey:keys];
return dic;
}
//获取字符串(或汉字)首字母
+ (NSString *)firstCharacterWithString:(NSString *)string{
NSMutableString *str = [NSMutableString stringWithString:string];
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO);
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
NSString *pingyin = [str capitalizedString];
return [pingyin substringToIndex:1];
}
使用如下：
NSArray *arr = @[@"guangzhou", @"shanghai", @"北京", @"henan", @"hainan"];
NSDictionary *dic = [Utilities dictionaryOrderByCharacterWithOriginalArray:arr];
NSLog(@"\n\ndic: %@", dic);
输出结果如下：
输出结果
判断字符串中是否含空格
+ (BOOL)isHaveSpaceInString:(NSString *)string{
NSRange _range = [string rangeOfString:@" "];
if (_range.location != NSNotFound) {
return YES;
}else {
return NO;
}
}
判断字符串中是否含有某个字符串
+ (BOOL)isHaveSpaceInString:(NSString *)string{
NSRange _range = [string rangeOfString:@" "];
if (_range.location != NSNotFound) {
return YES;
}else {
return NO;
}
}
判断字符串中是否含有中文
+ (BOOL)isHaveChineseInString:(NSString *)string{
for(NSInteger i = 0; i < [string length]; i++){
int a = [string characterAtIndex:i];
if (a > 0x4e00 && a < 0x9fff) {
return YES;
}
}
return NO;
}
判断字符串是否全部为数字
+ (BOOL)isAllNum:(NSString *)string{
unichar c;
for (int i=0; i<string.length; i++) {
c=[string characterAtIndex:i];
if (!isdigit(c)) {
return NO;
}
}
return YES;
}
将字典对象转换为JSON字符串
+ (NSString *)jsonPrettyStringEncoded:(NSDictionary *)dictionary{
if ([NSJSONSerialization isValidJSONObject:dictionary ]) {
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
if (!error) {
NSString *json = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
return json;
}
}
return nil;
}
将数组对象转换为JSON字符串
+ (NSString *)jsonPrettyStringEncoded:(NSArray *)array{
if ([NSJSONSerialization isValidJSONObject:array]) {
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:array options:NSJSONWritingPrettyPrinted error:&error];
if (!error) {
NSString *json = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
return json;
}
}
return nil;
}
