例如,要截取一个字符串中,两个指定字符串中间的字符串,OC截取方法如下:
// 要截取 "> 和 </ 之间的汉字内容: @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; NSString *string = @"<a href=\"http\">这是要截取的内容</a>"; NSRange startRange = [string rangeOfString:@"\">"]; NSRange endRange = [string rangeOfString:@"</"]; NSRange range = NSMakeRange(startRange.location + startRange.length, endRange.location - startRange.location - startRange.length); NSString *result = [string substringWithRange:range]; NSLog(@"%@",result); } @end运行结果:
为了使用方便,我们可以给 NSString 分类添加一个截取字符创的方法,直接返回截取后的字符串:代码如下
// NSString 分类中实现如下方法: #import "NSString+Extension_NSString.h" @implementation NSString (Extension_NSString) // 截取字符串方法封装 // 截取字符串方法封装 - (NSString *)subStringFrom:(NSString *)startString to:(NSString *)endString{ NSRange startRange = [self rangeOfString:startString]; NSRange endRange = [self rangeOfString:endString]; NSRange range = NSMakeRange(startRange.location + startRange.length, endRange.location - startRange.location - startRange.length); return [self substringWithRange:range]; } @end // 控制器中直接用字符串调用: #import "ViewController.h" #import "NSString+Extension_NSString.h" @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; NSString *string = @"<a href=\"http\">这是要截取的内容</a>"; NSString *result = [string subStringFrom:@"\">" to:@"</"]; NSLog(@"%@",result); } // 这样使用起来更方便,简洁