将UISlider的值从1增加到1
我是新来的iPhone，
我如何让我的UISlider以1为增量从1到100？
slider = [[UISlider alloc] init]; [slider addTarget:self action:@selector(sliderChange:) forControlEvents:UIControlEventValueChanged]; [slider setBackgroundColor:[UIColor clearColor]]; slider.minimumValue = 1; slider.maximumValue = 100; slider.continuous = YES; slider.value = 0.0; - (IBAction)sliderChange:(id)sender{ NSLog(@"slider.value=%f",slider.value); }
当我滑动我的日志显示…
slider.value = 1.000000 slider.value = 1.123440 slider.value = 1.234550 slider.value = 1.345670 slider.value = 1.567890 . . .
我想滑块值为1.0,2.0,3.0等…
任何帮助将appriciated。
你可以试试这个：
float RoundValue(UISlider * slider) { return roundf(slider.value * 2.0) * 1; }
//Only generate update events on release slider.continuous = NO; //Round the value and set the slider - (IBAction)sliderChange:(id)sender { int rounded = sender.value; //Casting to an int will truncate, round down [sender setValue:rounded animated:NO]; NSLog(@"%f", sender.value); }
yourSlider.minimumValue = 1; yourSlider.maximumValue = 100; [yourSlider addTarget:self action:@selector(roundValue) forControlEvents:UIControlEventValueChanged]; - (void)roundValue{ yourSlider.value = round(yourSlider.value); }
也看到这个波纹pipe答案有帮助的玩具你，给一些想法…
UISlider递增
也可能会给你一些想法..
UISlider增量为5
更改
` NSLog(@"slider.value=%f",slider.value);`
至
NSLog(@"slider.value=%.f",slider.value);
如果你想要一个数字，那么：
NSLog(@"slider.value=%.0f",slider.value);
但这会给你像1.0,1.1，….
这里是UISlider简单例子
headereFile.h
#import <UIKit/UIKit.h> @interface ViewController : UIViewController<UIScrollViewDelegate,UITextFieldDelegate> { IBOutlet UISlider *slider; IBOutlet UILabel *lbl; IBOutlet UITextField *txtField; IBOutlet UIButton *btn; IBOutlet UISwitch *swich; IBOutlet UIScrollView *scView; } @property(nonatomic,retain)UISlider *slider; @property(nonatomic,retain)UILabel *lbl; @property(nonatomic,retain)UITextField *txtField; @property(nonatomic,retain)UIButton *btn; @property(nonatomic,retain)UIScrollView *scView; @property(nonatomic,retain)UISwitch *swich; -(IBAction)sliderChanged:(UISlider *)slider; -(IBAction)ButtonPressed:(id)sender; -(IBAction)showTextField:(id)sender; @end
implementFile.m
#import "ViewController.h" @interface ViewController () @end @implementation ViewController @synthesize slider,lbl,txtField,btn,scView,swich; - (void)viewDidLoad { self.view.backgroundColor=[UIColor groupTableViewBackgroundColor]; self.scView=[[UIScrollView alloc] initWithFrame:CGRectMake(0, 0,320,460)]; self.scView.delegate=self; self.scView.contentSize=CGSizeMake(320,465); [self.view addSubview:self.scView]; self.slider=[[UISlider alloc] initWithFrame:CGRectMake(50,270,220,30)]; self.slider.minimumValue=0.00; self.slider.maximumValue=100.00; self.slider.thumbTintColor=[UIColor redColor]; [self.slider addTarget:self action:@selector(sliderChanged:) forControlEvents:UIControlEventValueChanged]; [self.scView addSubview:self.slider]; self.lbl=[[UILabel alloc] initWithFrame:CGRectMake(135, 290,200,30)]; self.lbl.backgroundColor=[UIColor clearColor]; NSString *str=[NSString stringWithFormat:@"%.f",[self.slider value]]; self.lbl.text=str; [self.scView addSubview:self.lbl]; self.txtField=[[UITextField alloc] initWithFrame:CGRectMake(50, 220,150,30)]; self.txtField.borderStyle=UITextBorderStyleRoundedRect; self.txtField.delegate=self; self.txtField.returnKeyType=UIReturnKeyDone; self.txtField.placeholder=@"Enter 1 to 100"; [self.scView addSubview:self.txtField]; self.btn=[UIButton buttonWithType:UIButtonTypeRoundedRect]; self.btn.frame=CGRectMake(205, 215,64, 37); [self.btn setTitle:@"Change" forState:UIControlStateNormal]; [self.btn addTarget:self action:@selector(ButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; [self.scView addSubview:self.btn]; self.swich=[[UISwitch alloc] initWithFrame:CGRectMake(124,140, 75,40)]; [self.swich addTarget:self action:@selector(showTextField:) forControlEvents:UIControlEventValueChanged]; self.swich.on=YES; /* ((UILabel *)[[[[[[self.swich subviews] lastObject] subviews] objectAtIndex:2] subviews] objectAtIndex:0]).text = @"Foo"; ((UILabel *)[[[[[[self.swich subviews] lastObject] subviews] objectAtIndex:2] subviews] objectAtIndex:1]).text = @"Bar"; */ [self.scView addSubview:self.swich]; [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. } -(IBAction)showTextField:(id)sender { if (self.swich.on) { [self.swich setOn:YES animated:YES]; self.txtField.hidden=NO; self.btn.hidden=NO; } else { [self.swich setOn:NO animated:YES]; self.txtField.hidden=YES; self.btn.hidden=YES; } } - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField { self.scView.frame=CGRectMake(0, 0,320,230); return YES; } - (BOOL)textFieldShouldEndEditing:(UITextField *)textField { [self.txtField resignFirstResponder]; self.scView.frame=CGRectMake(0, 0,320,460); return YES; } -(IBAction)sliderChanged:(UISlider *)slider; { NSString *str=[NSString stringWithFormat:@"%.f",[self.slider value]]; self.lbl.text=str; } -(IBAction)ButtonPressed:(id)sender { NSString *values=[self.txtField text]; float Values=[values floatValue]; if (Values<=100) { self.slider.value=Values; self.lbl.text=values; } else { UIAlertView *connectFailMessage = [[UIAlertView alloc] initWithTitle:@"NSURLConnection " message:@"Plz...Entre Proper Value !!!" delegate: self cancelButtonTitle:@"Ok" otherButtonTitles: nil]; [connectFailMessage show]; } } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); } @end
当我想将增量设置为0.5时，我使用这一点代码。 它适用于1或任何其他号码
- (void) getSliderValue:(UISlider *)paramSender{ float increment = 0.5; if ([paramSender isEqual:self.slider]){ //remove if you only have one slider float newValue = paramSender.value /increment; paramSender.value = floor(newValue) * increment; } NSLog(@"Current value of slider is %f", paramSender.value); }
我知道我迟到了，但我最近也不得不这样做。 这里是我如何使用XCode 8.3.2在swift中完成的：
@IBAction func sliderValueChanged(_ slider: UISlider) { label.text = Int(slider.value) }
Simples！ 我知道我可以使用“Any”而不是“Uislider”，但我认为这使得我的意图更清晰;）