从@中删除字符串

Question

NSString *string=@"[email protected]";

现在我想从 @ 中删除导致“test1”的字符串的所有字符。 请建议我如何做到这一点。 提前致谢！！

Answer 1

您可以使用该方法

- (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target 
                                        withString:(NSString *)replacement

，因此您的代码应如下所示。

string = [string stringByReplacingOccurrencesOfString:@"sdk.com" withString:@""];

编辑：

使用componentsSeparatedByString方法，

 NSArray* myArray = [string componentsSeparatedByString:@"@"];

现在你的数组恰好包含两个组件，

NSMutableString* myStringBefore = [myArray objectAtIndex:0];

如果你仍然想在字符串末尾添加@..

[myStringBefore appenString:@"@"];

Answer 2

您可以使用 substringToIndex

string = [ string substringToIndex:5 ] ;
// If @ location is subject to change, then first find it's location index and
// pass it.

Answer 3

 NSMutableString *string1 = [NSMutableString stringWithString: @"[email protected]"];
 NSArray* arr = [string1 componentsSeparatedByString:@"@"];
[string1 deleteCharactersInRange: [string1 rangeOfString: [NSString stringWithFormat:@"@%@",[arr objectAtIndex:1]]]];

Answer 4

int range=[string rangeOfString:@"@"].location; 
NSLog(@"%d",range); 
NSLog(@"%@",[string substringToIndex:range]);