字符串大小寫轉(zhuǎn)換
NSString *testString = @"Hello World";
//大寫轉(zhuǎn)化為小寫
NSString *lowerCaseString1 = [testString lowercaseString];
//小寫轉(zhuǎn)化為大寫
NSString *upperCaseString2 = lowerCaseString1.uppercaseString;
字符串中去除空格
NSString *text = [myStr stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]；
** 獲取包含中文的字符串長度**
方法一：
- (int)convertToInt:(NSString*)strtemp
{
int strlength = 0;
char* p = (char*)[strtemp cStringUsingEncoding:NSUnicodeStringEncoding];
for (int i=0 ; i<[strtemp lengthOfBytesUsingEncoding:NSUnicodeStringEncoding] ;i++) {
if (*p) {
p++;
strlength++;
}
else {
p++;
}
}
return strlength;
}
方法二：
- (NSInteger)getToInt:(NSString*)strtemp
{
NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
NSData* da = [strtemp dataUsingEncoding:enc];
return [da length];
}
**是否含有中文字符串正則判斷
//判斷是否是純漢字
- (BOOL)isChinese
{
NSString *match = @"(^[\u4e00-\u9fa5]+$)";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF matches %@", match];
return [predicate evaluateWithObject:self];
}
//判斷是否含有漢字
- (BOOL)includeChinese
{
for(int i=0; i< [self length];i++)
{
int a =[self characterAtIndex:i];
if( a >0x4e00&& a <0x9fff){
return YES;
}
}
抽取字符串中中文字符串
//中文字符數(shù)組
NSArray *firstArray = [self getAStringOfChineseWord:str];
//中文順序字符串
NSString *chineseString2 = [firstArray componentsJoinedByString:@"”];
#pragma mark -獲取一段字符串中的中文字
+ (NSArray *)getAStringOfChineseWord:(NSString *)string
{
if (string == nil || [string isEqual:@""]) {
return nil;
}
NSMutableArray *arr = [[NSMutableArray alloc]init];
for (int i=0; i<[string length]; i++) {
int a = [string characterAtIndex:i];
if (a < 0x9fff && a > 0x4e00) {
[arr addObject:[string substringWithRange:NSMakeRange(i, 1)]];
}
}
return arr;
}
這是我在開發(fā)中遇到的關(guān)于字符串設(shè)置處理的一些情況处嫌，分享給大家，后續(xù)遇到新的還會持續(xù)更新，希望與大家交流學(xué)習(xí)翎迁。
