iPhone 上 Objective-C 中的 HTML 实体编码（将 '' 转换为 ''）

使用 Objective-C 编程语言开发 iPhone 应用程序时，经常会遇到处理 HTML 实体编码的需求。HTML 实体编码是将一些特殊字符（如 '<'、'>'、'&' 等）转换为对应的 HTML 实体，以便在 HTML 页面中正确显示这些字符。在 Objective-C 中，我们可以使用一些方法来进行 HTML 实体编码的转换。

objective-c
#import "NSString+HTMLEntities.h"
NSString *originalString = @"";
NSString *encodedString = [originalString stringByEncodingHTMLEntities];
NSLog(@"%@", encodedString); // 输出: <Hello, World!>

objective-c
#import 
@interface NSString (HTMLEntities)
- (NSString *)stringByEncodingHTMLEntities;
@end
@implementation NSString (HTMLEntities)
- (NSString *)stringByEncodingHTMLEntities {
    NSMutableString *encodedString = [NSMutableString stringWithString:self];
    NSDictionary *htmlEntities = @{
        @"<": @"<",
        @">": @">",
        @"&": @"&",
        // 其他 HTML 实体编码映射
    };
    
    for (NSString *entity in htmlEntities) {
        NSString *replacement = htmlEntities[entity];
        [encodedString replaceOccurrencesOfString:entity withString:replacement options:NSLiteralSearch range:NSMakeRange(0, encodedString.length)];
    }
    
    return encodedString;
}
@end

objective-c
#import 
@interface NSString (HTMLEntities)
- (NSString *)stringByEncodingHTMLEntities;
@end
@implementation NSString (HTMLEntities)
- (NSString *)stringByEncodingHTMLEntities {
    NSMutableString *encodedString = [NSMutableString stringWithString:self];
    NSDictionary *htmlEntities = @{
        @"<": @"<",
        @">": @">",
        @"&": @"&",
        // 其他 HTML 实体编码映射
    };
    
    for (NSString *entity in htmlEntities) {
        NSString *replacement = htmlEntities[entity];
        [encodedString replaceOccurrencesOfString:entity withString:replacement options:NSLiteralSearch range:NSMakeRange(0, encodedString.length)];
    }
    
    return encodedString;
}
@end