#example iOS 之后删除文本

Question

如何在一个单词之后删除 NSString 或 NSArray 的一部分，例如 #gallery-1 或两个“跳行”之后“？而且每次出现的句子都可以删掉吗？

我想删除 #gallery-1 之后或此 NSString（或 NSArray）中的 2 个跳过行之后的所有文本，并删除“CLICK HERE FOR LIVE PEAK WEBCAM”：

3rd March
Swell is 5 foot and cross shore, bitter in the cold wind. Maybe streedagh.

High tide: 1703 3.6m     CLICK HERE FOR LIVE PEAK WEBCAM
Low Tide: 1041 0.8m
3 day forecast to March 5th
Good swell all weekend but the winds are changing. Keep in an eye for gaps in the wind.


            #gallery-1 {
                margin: auto;
            }
            #gallery-1 .gallery-item {
                float: left;
                margin-top: 10px;
                text-align: center;
                width: 50%;
            }
            #gallery-1 img {
                border: 2px solid #cfcfcf;
            }
            #gallery-1 .gallery-caption {
                margin-left: 0;
            }
            /* see gallery_shortcode() in wp-includes/media.php */








 
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我想获得：

3rd March
    Swell is 5 foot and cross shore, bitter in the cold wind. Maybe streedagh.

    High tide: 1703 3.6m     CLICK HERE FOR LIVE PEAK WEBCAM
    Low Tide: 1041 0.8m
    3 day forecast to March 5th
    Good swell all weekend but the winds are changing. Keep in an eye for gaps in the wind.

Answer 1

这很简单。只需使用 NSString 类的实例方法即可。

删除事件

NSString *originalString = @"#gallery-1 {margin: auto;}#gallery-1 .gallery-item {float: left;margin-top: 10px;text-align: center;width: 50%;}";

NSString *processedString = [originalString stringByReplacingOccurrencesOfString:@"#gallery-1" withString:@""];

显然，原始字符串可以包含更长且多次出现的字符串。因此，如果它包含更多它们，那么所有出现的事件都将以单行方法为您替换。真的再简单不过了。

拆分

NSString *originalString = @"3rd March Swell is 5 foot and cross shore, bitter in the cold wind. Maybe streedagh.     High tide: 1703 3.6m     CLICK HER FOR LIVE PEAK WEBCAM  Low Tide: 1041 0.8m    3 day forecast to March 5th    Good swell all weekend but the winds are changing. Keep in an eye for gaps in the wind.#gallery-1 {margin: auto;}#gallery-1 .gallery-item {float: left;margin-top: 10px;text-align: center;width: 50%;}";

NSString *processedString = [[originalString componentsSeparatedByString:@"#gallery"] firstObject];

这里的字符串被分成许多部分（每个部分都是一个字符串，基本上文本被分割成小块），“分隔符”是作为参数放入的任何内容。所有组件都在一个 NSArray 中，我们真的只需要第一个。

Answer 2

嗯，离我的头顶有点远，输入是上面的字符串。

这会将字符串的组成部分用两条“跳过的行”隔开。

let finalComponents = input.componentsSeperatedByString("\n\n")
let wantedInfo = finalComponents[0] as String

要摆脱“点击此处查看实时峰值网络摄像头”：

let unwanted = "CLICK HERE FOR LIVE PEAK WEBCAM"
let finalString = wantedInfo.stringByReplacingOccurrencesOfString(unwanted, replacement:"")