我在视图控制器上有四个按钮和一个文本视图。这五个按钮有颜色,例如红色,黄色,绿色,蓝色和黑色。
当用户开始输入而不按下这些按钮时,键入的文本视图的颜色应该是黑色文本。如果用户按下红色按钮,那么该点文本的颜色应为红色,直到用户按下任何其他彩色按钮。
https://codex.wordpress.org/Child_Themes
了但不知道如何将其定制为我想要实现的目标。
答案 0 :(得分:1)
您需要使用NSAttributedString
类。
let defaultAttributes = [NSFontAttributeName: UIFont.systemFontOfSize(UIFont.systemFontSize()),
NSForegroundColorAttributeName: UIColor.blackColor()]
let text = "this text is red and yellow"
let str = NSMutableAttributedString(string: text, attributes: defaultAttributes)
str.setAttributes([NSForegroundColorAttributeName: UIColor.redColor()], range: (text as NSString).rangeOfString("red"))
str.setAttributes([NSForegroundColorAttributeName: UIColor.yellowColor()], range: (text as NSString).rangeOfString("yellow"))
textView.attributedText = str
答案 1 :(得分:1)
您可以使用NSMutableAttributedString来实现这一目标。这个想法是以下(我没有测试过,只是手写在这里):
NSString *str = @"stackoverflow";
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:str];
// Set foreground color of "stack" substring in our string to red
[attributedString addAttribute:NSForegroundColorAttributeName
value:[UIColor redColor];
range:NSMakeRange(0, 5)];
使用此方法,您可以实现将颜色应用于文本中所需范围的内容。
您可以将属性文本设置为UILabel:
yourLabel.attributedText = attributedString
答案 2 :(得分:1)
以下是我如何继续,如果它可以帮助你:
1- add one property to retain current Color and initialize it with black color
@property (nonatomic, retain) UIColor *curColor;//in your interface declaration
self.curColor = [UIColor blackColor];//Init it in Viewdidload for example
2-实现UITextViewDelegate
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
NSAttributedString *currentText = self.Textview.attributedText;//To store current text and its attributs
NSAttributedString *newOneText = [[NSAttributedString alloc] initWithString:text attributes:@{NSForegroundColorAttributeName:self.curColor}];//for the new text with selected color
NSMutableAttributedString *shouldDisplayText = [[NSMutableAttributedString alloc] initWithAttributedString: currentText];
[shouldDisplayText appendAttributedString: newOneText];// add old and new text
self.Textview.attributedText = shouldDisplayText;//set it ton control
return NO;
}
3-添加IBAction以改变颜色 =>
- (IBAction) redColorClicked
{
self.curColor = [UIColor colorWithRed:1.0f green: 0.0f blue:0.0f alpha:1.0f];
}
- (IBAction) blueColorClicked
{
self.curColor = [UIColor colorWithRed:0.0f green: 0.0f blue:1.0f alpha:1.0f];
}