我需要显示一个每秒都会改变的字符串。
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
上述字符串需要显示多个文本属性,例如 -
1)文字的颜色 - '视图将以秒为单位刷新'将为白色 2)数字的颜色 - '10','09'......将为黄色。
如下面的参考资料所示:
如何只使用一个标签来实现这一目标?
非常感谢提前。
答案 0 :(得分:2)
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;
答案 1 :(得分:0)
您可以使用这样的字符串属性(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NSString中包含变量,您可以使用:
[NSString stringWithFormat:@"Hello %@ !", myVariable]; // %@ will be replace by myVariable
答案 2 :(得分:0)
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];
}
}
答案 3 :(得分:0)
在storyboard中创建一个标签,设置约束,使其可以容纳可变宽度 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
答案 4 :(得分:-1)
如果它在webview中,我们可以使用CSS,但它是UILabel所以你可以使用UILabel的以下链接: -
1)https://github.com/AliSoftware/OHAttributedLabel/
2)https://github.com/mattt/TTTAttributedLabel/
3)https://github.com/joaoffcosta/UILabel-FormattedText
希望这会为你工作。