这里总结一下字符串NSString与NSMutableString。 一....NSString NSString代表字符序列不可变的字符串，NSString的功能非常强大，OC的字符串处理比C语言的饿字符串简单、易用得多。 ...创建两个字符串对象： NSString *str1 = @"this is string A"; NSString *str2 = @"this is string B"; 计算字符串中的字符个数...; 18 NSString *str1 = @"this is string A"; 19 NSString *str2 = @"this is string B"; 20...; 10 11 NSString *str1 = @"this is string A"; 12 NSString *search , *replace
今天在看书上的一段代码时，发现NSString实例化时，有时用的是initWithFormat方法，有时用的是stringWithFormat，到底应该如何选择呢？...区别： 1、initWithFormat是实例方法 只能通过 NSString* str = [[NSString alloc] initWithFormat:@"%@",@"Hello World"]...调用，但是必须手动release来释放内存资源 2、stringWithFormat是类方法 可以直接用 NSString* str = [NSString stringWithFormat:@"%@...） 而且提出了一个常见错误: label.text = [[NSString alloc] initWithFormat:@"%@",@"abc"]; 最后在dealloc中将label给release...解决办法有二个: 1、 NSString * str = [[NSString alloc] initWithFormat:@"%@",@"abc"]; label.text = str; [str release
在开发中经常会遇到Float类型转化成NSString类型后不准确的问题 float a = 0.96; NSString *str = [NSString stringWithFormat:@"%.1f...NSLog(@"%@",str); 打印 2018-05-25 16:24:14.457366+0800 Test[19641:4237944] 1.0 我们想要的是输出0.9 这种问题怎么处理 可以写一个NSString...的Category来处理 #import "NSString+Precision.h" @implementation NSString (Precision) /** Float 类型转化成字符串获取小数点后...N位 @param value 需要转化的Value @param position 小数点后几位 @return 转化后的字符串 */ + (NSString *)decimalNumberWithFloat...:(float)value position:(int)position { NSString *doubleString = [NSString stringWithFormat
我的方法是通过格式化的命名： //这是一个规范缓存命名的方法 func checkString(str:NSString)->NSString{ let result:NSMutableString...(i)>=48&&str.characterAtIndex(i)characterAtIndex(i)>=65&&str.characterAtIndex(i)characterAtIndex...characterAtIndex(i)>=48&&url?.characterAtIndex(i)characterAtIndex(i)>=65&&url?....NSString result = imagedic.allKeys[i] as! ...NSString result = imagedic.allKeys[i] as!
phChar = [phStr characterAtIndex:0]; } if (textField) { NSString* text = textField.text...,遇到空格则多删除一次 if (range.location == text.length - 1 ) { if ([text characterAtIndex...range.location; if (range.location characterAtIndex...phChar = [phStr characterAtIndex:0]; } if (textField) { NSString* text = textField.text...,遇到空格则多删除一次 if (range.location == text.length - 1 ) { if ([text characterAtIndex
with a lowercase letter; camel case is used again for multiple words, like these examples from the NSString...class: length characterAtIndex: lengthOfBytesUsingEncoding: If a method takes one or more arguments...returns a value, for example, the first word normally indicates what will be returned, like the length , character...return value, as with the mutableCopy , capitalizedString or lastPathComponent methods from the NSString
代码如下： // rc4加密 - (NSString *)rc4Encode:(NSString *)aInput key:(NSString *)aKey { NSMutableArray *...i]]; } int j=1; for (short i=0; i<256; i++) { UniChar c = [aKey characterAtIndex...*)rc4Decode:(NSString *)data key:(NSString*)secret{ // 如果是16进制字符串 NSData *raw = [self ByteDataFromString...'}; int i; for (i=0; i < [targetStr length] / 2; i++) { byte_chars[0] = [targetStr characterAtIndex...:i*2]; byte_chars[1] = [targetStr characterAtIndex:i*2+1]; *whole_byte = strtol(byte_chars
://blog.csdn.net/luoyeffcs/article/details/18610839 5 objective-c ASCII NSString转换 objective-c ASCII...NSString转换--分享 // NSString to ASCII NSString *string = @"A"; int asciiCode = [string characterAtIndex...: 0]; //65 //ASCII to NSString int asciiCode = 65; NSString *string =[NSString stringWithFormat: @"%c...]; 8 【JSON】NSDictionary与NSString互转 NSString *str = [dataDic JSONRepresentation]; NSDictionary *resultDic...错误显示：direct access to Objective-C's isa is deprecated in favorof object_getClass() 看资料说是 使用 array
)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString... *)filterEmoji:(NSString *)string { NSUInteger len = [string lengthOfBytesUsingEncoding:NSUTF8StringEncoding...substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) { const unichar hs = [substring characterAtIndex...if (0xd800 <= hs && hs <= 0xdbff) { if (substring.length > 1) { const unichar ls = [substring characterAtIndex... } else if (substring.length > 1) { const unichar ls = [substring characterAtIndex
NSData－> NSString NSString *aString = [[NSString alloc] initWithData:adataencoding:NSUTF8StringEncoding...]; NSString－>NSData NSString *aString = @"1234abcd"; NSData *aData = [aString dataUsingEncoding: NSUTF8StringEncoding...*hexStr=@""; for(int i=0;i<[encryData length];i++) { NSString *newHexStr = [NSString stringWithFormat...int i=0;i<[hexString length];i++) { int int_ch; /// 两位16进制数转化后的10进制数 unichar hex_char1 = [hexString characterAtIndex...Ascll - 65 else int_ch1 = (hex_char1-87)*16; //// a 的Ascll - 97 i++; unichar hex_char2 = [hexString characterAtIndex
ios开发－数据类型转换 1，NSData 与 NSString NSData --> NSString NSString*aString = [[NSString alloc] initWithData...:adata encoding:NSUTF8StringEncoding]; NSString --> NSData NSString*aString = @"1234"; NSData*aData =... *hexStr=@""; for(int i=;i<[encryData length];i++) { NSString *newHexStr = [NSString stringWithFormat...int i=;i<[hexString length];i++) { int int_ch; /// 两位16进制数转化后的10进制数 unichar hex_char1 = [hexString characterAtIndex...Ascll - 65 else int_ch1 = (hex_char1-87)*16; //// a 的Ascll - 97 i++; unichar hex_char2 = [hexString characterAtIndex
String vs NSString JavaScript string Obj-C NSString charAt(index) (see text) charCodeAt(index) - (unichar...)characterAtIndex:(NSUInteger)index concat(string) - (NSString *)stringByAppendingString:(NSString *)...:(NSString *)aString split(delimiter) - (NSArray *)componentsSeparatedByString:(NSString *)separator...substring(startIndex) - (NSString *)substringWithRange:(NSRange)aRange toLowerCase() - (NSString *)lowercaseString...toUpperCase() - (NSString *)uppercaseString Array vs NSArray JavaScript Array Obj-C NSArray length
initWithFormat 是实例方法，用法如下： NSString* str = [[NSString alloc] initWithFormat:@"%@", @"Hello, world!"]...stringWithFormat 是类方法， 用法如下： NSString* str = [NSString stringWithFormat:"%@", @"Hello, world!"]...setNumberStyle:NSNumberFormatterDecimalStyle]; NSNumber* num = [f numberFromString:str]; 常用字符串格式化说明 %@ Objective-C...(unsigned char), printed by NSLog() as an ASCII character, or, if not an ASCII character, in the octal...(unichar), printed by NSLog() as an ASCII character, or, if not an ASCII character, in the octal format
剩余的只能自己判断截取了 //是否含有表情 - (BOOL)stringContainsEmoji:(NSString *)string { __block BOOL returnValue =...options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString...substringRange, NSRange enclosingRange, BOOL *stop) { const unichar hs = [substring characterAtIndex...if (substring.length > 1) { const unichar ls = [substring characterAtIndex...} else if (substring.length > 1) { const unichar ls = [substring characterAtIndex
一直以来使用的解析方式（iOS13之前）都是如下： Objective-C: NSString *token = [[deviceToken description] stringByTrimmingCharactersInSet...: "") .replacingOccurrences(of: " ", with: "") //当然下面这种方式性能更好： let charactersToRemove: SetCharacter...stackoverflow中有人说过这样的解析方式并不好，但是一直没有问题，所以大家也就习惯了这样的解析方式了，但是iOS13中这样的解析方式就有问题了 大家可以更新解析方式为下面这样的方式（兼容各个版本）： Objective-C...deviceToken isKindOfClass:[NSData class]]) return; const unsigned *tokenBytes = [deviceToken bytes]; NSString...*hexToken = [NSString stringWithFormat:@"%08x%08x%08x%08x%08x%08x%08x%08x",
Objective-C相关 1、NSString的length字符长度和C++中的string的length字符长度 NSString的length是字符长度，以UTF16来表示，比如说中文字符，@"中文字符..."，length=4； C++中的string的length是字符串长度，比如说"abc"，length=3； 所以想要判断某个NSString的字符串长度，或者去获取某个特定的字符，用-characterAtIndex
Objective-C里核心的处理字符串的类就是NSString和NSMutableString这两个类，这两个类完成了Objective-C中字符串大部分功能的处理，我们今天的重点就是这两个类了。...（后面内容转载自：玩转 NSString） 一 NSString 1.1 字符串属性 //////////字符串属性////////// NSString *str1 = @"string...NSLog(@"哈希地址: %lu", (unsigned long)str1.hash); NSLog(@"字符串对应下标字符: %c", [str1 characterAtIndex...)localizedStandardCompare:(NSString *)string; //9.判断两个字符串是否内容一致 - (BOOL)isEqualToString:(NSString *)...:(NSString *)str options:(NSStringCompareOptions)mask; //4.是否包含字符串 - (BOOL)containsString:(NSString *
NSString* stu3=[dd capitalizedString]; //拼接方法（1） NSString* stu4=[NSString stringWithFormat:@"...字符串(NSString)与数值(int,NSInteger)的基本转换 假设有 NSString *tempA = @"123"; NSString *tempB = @"456"; 1....*contains = substring; const unichar hs = [substring characterAtIndex:0];...if (substring.length > 1) { const unichar ls = [substring characterAtIndex...} else if (substring.length > 1) { const unichar ls = [substring characterAtIndex
1、判断是否有中文 + (BOOL)IsChinese:(NSString *)str { for(int i=0; i< [str length];i++){ int a =...[str characterAtIndex:i]; if(a > 0x4e00 && a < 0x9fff) { return YES;...} } return NO; } 2、过滤特殊字符串 + (NSString *)isSpecialCharacter:(NSString *)str{ NSCharacterSet...*)filterCharacterFromOriginStr:(NSString *)originalString { NSMutableString *numberString = [[NSMutableString...alloc] init]; NSString *tempStr = [[NSString alloc] init]; NSScanner *scanner = [NSScanner scannerWithString
领取专属 10元无门槛券
手把手带您无忧上云
云服务器
ICP备案
对象存储
腾讯会议
云直播
