Objective-C Foundation架構實踐——NSString（三）__foundation

#import <Foundation/Foundation.h>int main(int argc, const char * argv[]) {  @autoreleasepool {        //////////////////////////////////////////////////////////////////////        //判斷兩個字串是否相同；    NSString *string1 = @"Hello World";    BOOL ss = [string1 isEqualToString:@"A"];    NSLog(@"%hhd",ss);            //比較字串    /*     NSComparisonResult的結果是一個枚舉類型，          enum {     NSOrderedAscending = -1,     NSOrderedSame,     NSOrderedDescending     };     typedef NSInteger NSComparisonResult;          NSOrderedAscending：座標的字串比右邊的小；-1     NSOrderedSame：左右的字串相等；0     NSOrderedDescending：左邊的字串比右邊的大；1          */    NSComparisonResult result = [string1 compare:@"B"];    NSLog(@"比較字串 %ld",(long)result);            //分割；    //按照指定字元分割字元分割字串；    NSString *string2 = @"a,b,c,d,e,f,g";    NSArray *array = [string2 componentsSeparatedByString:@","];        //遍曆數組中的每一個字元；    for (NSString *s in array) {      NSLog(@"%@",s);    }            //按照範圍截取字串；    NSString *string3 = @"abcdefgh";    NSRange range = NSMakeRange(0, 3);    NSString *string4 = [string3 substringWithRange:range];//使用範圍去截取一個字串    NSLog(@"string4 = %@",string4);            //從某一位開始截取字串到最後一位；    NSString *string5 = [string3 substringFromIndex:3];    NSLog(@"string5 = %@",string5);        //從開頭截取字串到某一位；截取到某一位之前；    NSString *string6 = [string3 substringToIndex:3];    NSLog(@"string6 = %@",string6);            //將字串拆分為每一個字元；    for (int i = 0 ; i < string3.length ; i++) {      //返回的是一個字元；      NSLog(@"%c",[string3 characterAtIndex:i]);    }        //尋找    NSString *string7 = @"ab cd ef gh ij kl";    //尋找指定字串的位置；    NSRange range2 = [string7 rangeOfString:@"ef"];    NSLog(@"length = %lu; location = %lu",(unsigned long)range2.length,(unsigned long)range2.location);            //替換    NSString *string8 = @"ab cd ef gh ij kl";    NSString *string9 = [string8 stringByReplacingOccurrencesOfString:@"gh" withString:@"Hello"];    NSLog(@"string9 = %@",string9);        NSString *string10 = [string8 stringByReplacingCharactersInRange:NSMakeRange(3, 2) withString:@"iOS"];    NSLog(@"string10 = %@",string10);            return 0;  }}

輸出結果如下：

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