如何從目標c中的動態字符串中提取子字符串？

Question

我有一個字符串，如@"Greetings from Capt. Ashim Mittra,​ Vice President – Flight Operations"，我想從中提取「Capt。阿希姆米特拉「。即我想從「從」字開始，讀「」（逗號）

Answer 1

你可以做這樣的事情，

NSString *str = @"Greetings from Capt. Ashim Mittra,​ Vice President – Flight Operations"; 

NSRange range1 = [str rangeOfString:@"from"]; 
NSRange range2 = [str rangeOfString:@","]; 
NSRange rangeToSubString = NSMakeRange(range1.location + range1.length, range2.location - range1.location - range1.length); 

NSString *resultStr = [str substringWithRange:rangeToSubString]; 

NSLog(@"path1 : %@",resultStr); 

可以歸因文字設爲您的標籤，否則當你想展現大膽一部分喜歡你的文字，

UIFont *font = [UIFont boldSystemFontOfSize:17.0]; // whatever size, can use diiferent font with different method 

NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:font,NSFontAttributeName, nil]; 

NSMutableAttributedString *resultStrWithBold = [[NSMutableAttributedString alloc]initWithString:str]; 

[resultStrWithBold setAttributes:dict range:rangeToSubString]; 

yourLabel.attributedText = resultStrWithBold; 

Answer 2

使用此代碼：

NSString * yourStr = @"Greetings from Capt. Ashim Mittra,​ Vice President – Flight Operations"; 
NSRange range1 = [yourStr rangeOfString:@"from"]; 
NSRange range2 = [yourStr rangeOfString:@","]; 
NSRange rangeSubString = NSMakeRange(range1.location + range1.length, range2.location - range1.location - range1.length); 
NSString *finalString = [yourStr substringWithRange: rangeSubString]; 

爲了讓大膽地使用這一點;

NSMutableAttributedString * yourAttributedString = [[NSMutableAttributedString alloc] initWithString: finalString]; 
[yourAttributedString addAttribute: NSFontAttributeName value:[UIFont boldSystemFontOfSize:12] range:NSMakeRange(0,finalString)]; 
[yourLbl setAttributedText: yourAttributedString]; 

Answer 3

您可以使用正則表達式來查找名稱 - 這裏是一個示例：

​​

這可能需要改進很多，但您需要檢查所有輸入數據以進行正確調整。它會在輸入字符串中找到幾個名稱。

Answer 4

您可以使用下面的代碼：

- (void)viewDidLoad { 
[super viewDidLoad]; 
NSString *str = @"Greetings from Capt. Ashim Mittra ,​ Vice President – Flight Operations"; 
NSString *fromString = @"from"; 
NSString *toString = @","; 

NSArray *seperatorArr = [[NSArray alloc] initWithObjects:fromString, toString, nil]; 
NSString *reqStr = [self extractSubstringFrom:str seperatedBy:seperatorArr]; 
} 

- (NSString *)extractSubstringFrom:(NSString *)string seperatedBy:(NSArray *)seperatorArray { 

NSString *resultingString = string; 

for (int i = 0; i < seperatorArray.count; i++) { 
    NSArray *newStrArr = [resultingString componentsSeparatedByString:[seperatorArray objectAtIndex:i]]; 
    if (i == seperatorArray.count - 1) { 
     resultingString = [newStrArr firstObject]; 
    } 
    else 
     resultingString = [newStrArr lastObject]; 
} 
NSLog(@"Resulting String = %@",resultingString); 
return resultingString; 

}