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[英]Trigger button to change text in UITextView in swift3 xcode 8 ios 10
[英]How to change color of text strings inside UITextView in Swift3
我在这里查看了一些现有的问题帖子,我尝试实现所有代码,但最终无法成功实现任何代码。 实际上,我想我已经理解了如何在初始设置文本的情况下更改UITextView
中某些文本的颜色,但是我不明白的是,当我的UITextView
开始进入编辑时,它似乎根本无法正常工作。 在下面,我尝试的代码完全满足了我想要的行为。
func textViewDidBeginEditing(_ textView: UITextView) {
let main_string = ""
let getData: [String] = userDefaults.object(forKey: "myData") as! [String]
print("\(getData)")
let searchWords = "world"
let range = (main_string as NSString).range(of: searchWords)
let attribute = NSMutableAttributedString.init(string: main_string)
attribute.addAttribute(NSForegroundColorAttributeName, value: UIColor.red , range: range)
mytextView.attributedText = attribute
}
我通过命名MyData
保存输入数据。 我尝试使用 for 循环从getData
取出所有元素并将其用作单独的值。 但是,在控制台中,有这么多行的解释。 我认为这是一种正确的写作方式,但我的 mac 说 nooooooo。 但是,如果我在main_string
和searchWords
设置一个String
,例如, “这是我的问题。我希望人们从世界上帮助我” main_string 和 searchWords 中的“world”如代码中所写。 然后在加载应用程序后,在我的文本视图中,“世界”这个词完美地以红色突出显示,但在世界这个词之后,所有文本都是红色的。 我不明白为什么我会被这个未知的错误折磨。
所以我想要完成的是
myData
保存的日期来看,我只希望用户输入时及时突出存储的单词。例如,如果用户键入“hello”和“world”。 然后它们由myData
保存,并且只有在输入时才会突出显示。 并在输入未存储的单词时切换回正常颜色。我想我缺乏一些解释。 如果你需要知道什么,请帮我指出。 非常感谢!!
在此,我以字符串“world”为例。 当您在 textview 中输入时,此方法正在起作用
func textViewDidChange(_ textView: UITextView) {
let attrStr = NSMutableAttributedString(string:txtview.text)
let inputLength = attrStr.string.characters.count
let searchString = "world"
let searchLength = searchString.characters.count
var range = NSRange(location: 0, length: attrStr.length)
while (range.location != NSNotFound) {
range = (attrStr.string as NSString).range(of: searchString, options: [], range: range)
if (range.location != NSNotFound) {
attrStr.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSRange(location: range.location, length: searchLength))
range = NSRange(location: range.location + range.length, length: inputLength - (range.location + range.length))
textView.attributedText = attrStr
}
}
}
但是当您已经设置了 textview 的初始文本时,请使用此方法
func textViewDidBeginEditing(_ textView: UITextView) {
//Just set your text as you set in textview
let attrStr = NSMutableAttributedString(string: "hello world I ma jeckjklwefljlwjflkjwfkljelwfjklfgjwklfjlkwgjwlgkjwklsgjklsjgklsdjgkljdslkgjsdlkgjlksdjgldjsgldjskl world nsfhjklshfklhsllsd fgiw world")
let inputLength = attrStr.string.characters.count
let searchString = "world"
let searchLength = searchString.characters.count
var range = NSRange(location: 0, length: attrStr.length)
while (range.location != NSNotFound) {
range = (attrStr.string as NSString).range(of: searchString, options: [], range: range)
if (range.location != NSNotFound) {
attrStr.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSRange(location: range.location, length: searchLength))
range = NSRange(location: range.location + range.length, length: inputLength - (range.location + range.length))
textView.attributedText = attrStr
}
}
}
对于多个字符串,您可以这样做 SWIFT 3
func textViewDidChange(_ textView: UITextView) {
let attrStr = NSMutableAttributedString(string: txtview.text)
let inputLength = attrStr.string.characters.count
let searchString : NSArray = NSArray.init(objects: "hello","world")
for i in 0...searchString.count-1
{
let string : String = searchString.object(at: i) as! String
let searchLength = string.characters.count
var range = NSRange(location: 0, length: attrStr.length)
while (range.location != NSNotFound) {
range = (attrStr.string as NSString).range(of: string, options: [], range: range)
if (range.location != NSNotFound) {
attrStr.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSRange(location: range.location, length: searchLength))
range = NSRange(location: range.location + range.length, length: inputLength - (range.location + range.length))
textView.attributedText = attrStr
}
}
}
}
目标 C
对于多个字符串,您可以这样做
-(void)textViewDidChange:(UITextView *)textView
{
NSMutableAttributedString *attstr = [[NSMutableAttributedString alloc]initWithString:textView.text];
NSUInteger characterCount = [attstr length];
NSArray *arr = [[NSArray alloc]initWithObjects:@"football",@"player",nil];
for (int i=0; i<arr.count; i++) {
NSUInteger searchlength = [[NSString stringWithFormat:@"%@",[arr objectAtIndex:i]] length];
NSRange range1 = NSMakeRange(0, attstr.length);
while (range1.location != NSNotFound) {
range1 =[attstr.string rangeOfString:[NSString stringWithFormat:@"%@",[arr objectAtIndex:i]] options:0 range:range1];
if (range1.location !=NSNotFound) {
[attstr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(range1.location, searchlength)];
[attstr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:20.0] range:range1];
range1 = NSMakeRange(range1.location + range1.length, characterCount -(range1.location + range1.length));
textView.attributedText = attstr;
}
}
}
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