当用户输入“@”时从列表中搜索数据UITextView中的符号
问题描述:
当用户在UITextView
中输入特定搜索关键字时输入“@”时,是否有任何显示下拉列表的方法?当用户输入“@”时从列表中搜索数据UITextView中的符号
例如:
类型“@ios”和所有包含在下拉列表列表中显示单词“IOS”过滤字符串。
答
我通过不断地检查用户键入的文本来实现这一点。
func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
// if user type any latter from @,space and new line then clear the search string
if text == "@" || text == " " || text == "\n" {
self.searchString = ""
}
// append the type string in text view text
let resultString = textView.text.stringByAppendingString(text)
// break the line with @ symbol and find the occurence
let numberOfOccurrences = resultString.componentsSeparatedByCharactersInSet(NSCharacterSet(charactersInString: "@")).count - 1
// store all words for checking
let stringArray = resultString.componentsSeparatedByCharactersInSet(NSCharacterSet(charactersInString: "@")) ?? [String]()
// checking if string array > 1 that means string contains @ symbol
self.searchString = stringArray.count > 1 ? stringArray[numberOfOccurrences].containsString(" ") ? "" : stringArray[numberOfOccurrences] : ""
if self.searchString.characters.count > 0 {
self.getTopSearchFromLive(self.searchString)
} else {
self.tableView.hidden = true
}
return true
}
答
我认为你正在寻找的东西像this.This代表将被称为每当用户按下按键@
试试这个: -
func textView(_ textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
if (textView.text.appending(text) == "@") {
//trigger '@' operation
if arrayObject.contains(value) {
//Populate array and display tableview.
}
}
else if (textView.text.appending(text) == "/") {
//trigger/operation
}
//Same conditions go on
}
查看以下链接并根据您的要求进行修改。 https://github.com/EddyBorja/MLPAutoCompleteTextField https://www.raywenderlich.com/336/auto-complete-tutorial-for-ios-how-to-auto-complete-with-custom-values – Venkat