在标签中显示具有多个属性的字符串

Question

我需要显示一个每秒都会变化的字符串。

例如：

View will refresh in 10 sec
View will refresh in 09 sec
View will refresh in 08 sec
View will refresh in 07 sec
..
View will refresh in 0 sec

上面的字符串需要显示多个文本属性，比如-

1) 文本的颜色 - 'View will refresh in _ sec' 将为白色
2) 数字的颜色 - '10' , '09' ... 将为黄色。

如下参考所示：

如何只使用一个标签实现这一目标？

非常感谢。

Answer 1

NSMutableAttributedString *str = [[NSMutableAttributedString alloc] init];
[str appendAttributedString:[[NSAttributedString alloc] initWithString:@"Will change in " attributes:@{ NSFontAttributeName : [UIFont systemFontOfSize:17], NSForegroundColorAttributeName : [UIColor whiteColor] }]];
[str appendAttributedString:[[NSAttributedString alloc] initWithString:@"10 sec" attributes:@{ NSFontAttributeName : [UIFont systemFontOfSize:19], NSForegroundColorAttributeName : [UIColor yellowColor] }]];
myLabel.attributedText = str;

Answer 2

如果它在 webview 中，我们可以使用 CSS 但它是 UILabel，因此您可以使用以下 UILabel 链接：-

1) https://github.com/AliSoftware/OHAttributedLabel/

2) https://github.com/mattt/TTTAttributedLabel/

3) https://github.com/joaoffcosta/UILabel-FormattedText

希望这对你有用。

Answer 3

您可以像这样使用字符串属性 (DOC)：

NSMutableAttributedString *attr = [[NSMutableAttributedString alloc] initWithString:yourString];
[attr addAttribute: NSForegroundColorAttributeName value: [UIColor blackColor] range: NSMakeRange(0, 4)]; // color for char 0 to 4
[attr addAttribute: NSForegroundColorAttributeName value: [UIColor blueColor] range: NSMakeRange(4, 8)]; // color for char 4 to 8
[myLabel setAttributedText: attr];

然后要在您的 NSString 中包含变量，您可以使用：

[NSString stringWithFormat:@"Hello %@ !", myVariable]; // %@ will be replace by myVariable

Answer 4

试试这个

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSTimer *timer =  [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(updateLabelText:) userInfo:nil repeats:YES];
    NSMutableAttributedString *str = [[NSMutableAttributedString alloc] init];
    [str appendAttributedString:[[NSAttributedString alloc] initWithString:@"Will change in " attributes:@{ NSFontAttributeName : [UIFont systemFontOfSize:17], NSForegroundColorAttributeName : [UIColor whiteColor] }]];
    [str appendAttributedString:[[NSAttributedString alloc] initWithString:@"10 Sec" attributes:@{ NSFontAttributeName : [UIFont systemFontOfSize:19], NSForegroundColorAttributeName : [UIColor yellowColor] }]];
    myLabel.attributedText = str;
}

- (NSString *)extractNumberFromText:(NSString *)text
{
    NSCharacterSet *nonDigitCharacterSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
    return [[text componentsSeparatedByCharactersInSet:nonDigitCharacterSet] componentsJoinedByString:@""];
}
-(void)updateLabelText:(NSTimer *) timerLocal
{
    int labelCount =  [[self extractNumberFromText:myLabel.text]intValue];
    if (labelCount!=0)
    {
        labelCount--;

        NSMutableAttributedString *str = [[NSMutableAttributedString alloc] init];
        [str appendAttributedString:[[NSAttributedString alloc] initWithString:@"Will change in " attributes:@{ NSFontAttributeName : [UIFont systemFontOfSize:17], NSForegroundColorAttributeName : [UIColor whiteColor] }]];
        [str appendAttributedString:[[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@"%i Sec",labelCount] attributes:@{ NSFontAttributeName : [UIFont systemFontOfSize:19], NSForegroundColorAttributeName : [UIColor yellowColor] }]];
        myLabel.attributedText = str;
    }
    else
    {
        [timerLocal invalidate];
    }
}

Answer 5

在情节提要中创建标签设置约束，使其可以适应可变宽度将标签命名为 myLabel ;

这里是.m文件

    //
//  ViewController.m
//  TimerLogic
//
//

#import "ViewController.h"

@interface ViewController ()
{
    NSInteger currentTime ;
    NSTimer *myTimer ;
}

@end

@implementation ViewController
@synthesize myLabel ;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    currentTime = 10 ;
    [self.view addSubview:myLabel];
   myTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(createLabel:) userInfo:nil repeats:YES] ;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
-(void)createLabel:(NSTimer *)theTimer
{
    if(currentTime == 10)
    {
    myLabel.backgroundColor = [UIColor redColor] ;
    myLabel.text = @"Thats me" ;
        myLabel.textColor = [UIColor yellowColor];
        myLabel.translatesAutoresizingMaskIntoConstraints = NO ;
//        NSArray *constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V: | -offsetTop-[label]" options:0 metrics:@{@"offsetTop":@100 } views:NSDictionaryOfVariableBindings(myLabel)];
    }
    if(currentTime == 9)
    {
        myLabel.backgroundColor = [UIColor greenColor] ;
        myLabel.text = @"Thats me again 1" ;
         myLabel.textColor = [UIColor whiteColor];
    }
    if (currentTime == 8)
    {
        myLabel.backgroundColor = [UIColor greenColor] ;
        myLabel.text = @"Thats me again 2" ;
         myLabel.textColor = [UIColor blackColor];
    }

    // like that for all values
    if(currentTime == 7)
    {

        myLabel.backgroundColor = [UIColor purpleColor] ;
        myLabel.text = @"Thats me again 3" ;
         [myTimer invalidate ] ;
         myLabel.textColor = [UIColor yellowColor];
    }
       currentTime-- ;
}

@end

在标签中显示具有多个属性的字符串

Displaying a string with multiple attributes in a label

ios

nsstring

uilabel

nsattributedstring