NSScanner使用
+ (instancetype)scannerWithString:(NSString *)string
初始化一个NSScanner对象 并且指定该对象的String对象;
- (BOOL)scanUpToString:(NSString *)string intoString:(NSString * __nullable * __nullable)result;
表示从当前的scanLocation 开始扫描到指定的string字符串的尾部,同时把从当前scanLocation位置到string字符串尾部的的字符串放到地址为result的内存中;
例如以下代码 (代码引用的是JSPatch开源库中的代码)
1 NSString *string = @"MYChoiceAddressVC : UIViewController<UITableViewDataSource, UITableViewDelegate, UITextFieldDelegate>"; 2 NSScanner *scanner = [NSScanner scannerWithString:string]; 3 NSString *className; 4 NSString *superClassName; 5 NSString *protocolNames; 6 [scanner scanUpToString:@":" intoString:&className]; 7 if (!scanner.isAtEnd) { 8 scanner.scanLocation = scanner.scanLocation + 1; 9 [scanner scanUpToString:@"<" intoString:&superClassName]; 10 if (!scanner.isAtEnd) { 11 scanner.scanLocation = scanner.scanLocation + 1; 12 [scanner scanUpToString:@">" intoString:&protocolNames]; 13 } 14 }
代码输出
1 className:“MYChoiceAddressVC ”(因为原String中:前面带了空格 ,所以ClassName 后面带空格) 2 3 superClassName:”UIViewController“ 4 5 protocolNames:”UITableViewDataSource, UITableViewDelegate, UITextFieldDelegate“