Objective-c:NSString的常用方法

Nsstring提供了很多常用的方法，下面演示代码：

//------------------------------------------------------------------简单的方法

void baseMethod(){

NSLog(@"%@",base);

    base=  [base uppercaseString];

NSLog(@"%@",base);

    base = [base lowercaseString];

NSLog(@"%@",base);

   base = [base capitalizedString];

NSLog(@"%@",base);

}

//------------------------------------------------------------------比较方法

void compare(){

NSString *compareObject = @"Object";

BOOL result = [compareObject isEqualToString:@"Object"];

if(result){

NSLog(@"一样");

   }else {

NSLog(@"不一样");

   }

NSComparisonResult result2 = [compareObject compare:@"object"];

if(result2 == NSOrderedAscending){

   }elseif(result2 ==NSOrderedDescending){

   }elseif(result2 == NSOrderedSame){

NSLog(@"一样");

   }

NSComparisonResult result3= [compareObject caseInsensitiveCompare:@"object"];

if(result3 == NSOrderedAscending){

   }elseif(result3 ==NSOrderedDescending){

   }elseif(result3 == NSOrderedSame){

NSLog(@"一样");

   }

}

//------------------------------------------------------------------查找的方法

void nsstringSearch(){

NSString *string = @"book.txt";

BOOL result = [string hasSuffix:@".txt"];

   result = [string hasPrefix:@"book2"];

if(result){

NSLog(@"yes");

   }else{

NSLog(@"No");

   }

NSRange rang= [string2 rangeOfString:@"book"];

NSLog(@"length:%zi",rang.length);

   rang= [string2 rangeOfString:@"book"options:NSBackwardsSearch];

NSLog(@"length:%zi",rang.length);

NSRange rang4 = NSMakeRange(4, 12);

     rang= [string3 rangeOfString:@"book"options:NSBackwardsSearchrange:rang4];

NSLog(@"length:%zi",rang.length);

}

//------------------------------------------------------------------字符串截取

void stringSplit(){

NSString *string = @"hello world";

NSString *result = [string substringWithRange:[string rangeOfString:@"hello"]];

   result= [string substringFromIndex:3];

   result= [string substringToIndex:2];

NSLog(@"%@",result);

NSLog(@"%@",arry);

}

//------------------------------------------------------------------路径类的方法

void stringPat(){

NSString *path= [NSStringpathWithComponents:array];

NSLog(@"%@",path);

   array = [path pathComponents];

NSLog(@"%@",array);

bool bo= [path isAbsolutePath];

if(bo){

NSLog(@"是");

   }else{

NSLog(@"否");

   }

NSString *dir=   [path lastPathComponent];

NSLog(@"%@",dir);

    dir= [path stringByDeletingLastPathComponent];

NSLog(@"%@",dir);

    dir = [path stringByAppendingPathComponent:@"我的目录"];

NSLog(@"%@",dir);

}

//------------------------------------------------------------------转换的方法

void stringBaseMethod(){

NSUInteger length = [string length];

NSLog(@"%zi",length);

unichar  charAt =  [string characterAtIndex:5];

NSLog(@"%c",charAt);

NSString *number  =@"23";

NSUInteger numbers = [number intValue];

NSLog(@"%zi",numbers);

double doubles = [number doubleValue];

NSLog(@"%f",doubles);

float floats = [number floatValue];

NSLog(@"%f",floats);

constchar* charString = [number UTF8String];

NSLog(@"%s",charString);

}

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