Question

以下代码部分精美结果： - (void)setRepresentedObject:(id)representedObject { DLOG()

- (void) putLogInFunctionCalls{

NSString *string = @"- (void)setRepresentedObject:(id)representedObject {";
NSError *error = nil;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"^-[^{]+\{" options:NSRegularExpressionCaseInsensitive error:&error];

NSString *modifiedString = [regex stringByReplacingMatchesInString:string options:0 range:NSMakeRange(0, [string length]) withTemplate:[NSString stringWithFormat:@"%@ DLOG()", string]];

NSLog(@"%@", modifiedString);

}

但是，如果我尝试读取代码文件，而不是在变量字符串中只输入一行输入，请说包含以下代码的ViewController.m文件并将其放在该变量中：它不起作用。

//
//  ViewController.m
//  ForCommonCoding
//
//  Created by A Programmer on 7/6/17.
//  Copyright ? 2017 A Programmer. All rights reserved.
//

#import "ViewController.h"


@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    // Do any additional setup after loading the view.
}
- (void)setRepresentedObject:(id)representedObject {
         [super setRepresentedObject:representedObject];

     // Update the view, if already loaded.
}

- (void)sampleFunction {
    NSLog(@"This is sampleFunction");
}
@end

NSLog显示与输入相同。 DLog（）没有被提及任何人都可以帮忙解决它吗？

Answer 1

这应该按照您的预期工作：

NSError *error = nil;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"^(-[^{]+\{)" options:NSRegularExpressionAnchorsMatchLines error:&error];
NSString *modifiedString = [regex stringByReplacingMatchesInString:string options:0 range:NSMakeRange(0, [string length]) withTemplate:@"$1 DLOG()"];
NSLog(@"%@", modifiedString);

您的代码有三个问题：

缺少NSRegularExpressionAnchorsMatchLines，但您的行开头与^匹配
正则表达式中缺少匹配组，您可以在替换时使用匹配结果：()
替换模板字符串使用整个string代替第一个匹配$1

工作游乐场代码：

let line = "- (void)setRepresentedObject:(id)representedObject {"
let file = "#import \"ViewController.h\"\n\n\n@implementation ViewController\n\n- (void)viewDidLoad {\n    [super viewDidLoad];\n\n    // Do any additional setup after loading the view.\n}\n- (void)setRepresentedObject:(id)representedObject {\n         [super setRepresentedObject:representedObject];\n\n     // Update the view, if already loaded.\n}\n\n- (void)sampleFunction {\n    NSLog(@\"This is sampleFunction\");\n}\n@end"
let regex = try! NSRegularExpression(pattern: "^(-[^{]+\\{)", options: [.anchorsMatchLines])
regex.stringByReplacingMatches(in: line, options: [], range: NSMakeRange(0, line.characters.count), withTemplate: "$1 DLOG()")
regex.stringByReplacingMatches(in: file, options: [], range: NSMakeRange(0, file.characters.count), withTemplate: "$1 DLOG()")

NSRegularExpression：stringByReplacingMatchesInString不重建多行

1 个答案: