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  • iPhone控件之UISlider

     1 //
    2 // UITestViewController.m
    3 // UITest
    4 //
    5
    6 #import "UITestViewController.h"
    7
    8 UILabel *lblSliderValue;
    9
    10 @implementation UITestViewController
    11
    12 -(void)sliderAction:(id)sender
    13 {
    14 int stepAmount = 10;
    15 float stepValue = (abs([(UISlider *)sender value]) / stepAmount) * stepAmount;
    16 [sender setValue:stepValue];
    17
    18 lblSliderValue.text = [NSString stringWithFormat:@"%d",(int)stepValue];
    19 }
    20
    21
    22 - (void)viewDidLoad {
    23
    24 [super viewDidLoad];
    25
    26 CGRect sliderRect = CGRectMake(20,50,280,40);
    27 UISlider *mySlider = [[UISlider alloc] initWithFrame:sliderRect];
    28
    29 mySlider.minimumValue = 0;
    30 mySlider.maximumValue = 100;
    31 mySlider.continuous = YES;
    32
    33 //images
    34 UIImage *leftTrackImage = [[UIImage imageNamed:@"left_slider.png"] stretchableImageWithLeftCapWidth:5.0 topCapHeight:0.0];
    35 UIImage *rightTrackImage = [[UIImage imageNamed:@"right_slider.png"] stretchableImageWithLeftCapWidth:5.0 topCapHeight:0.0];
    36 UIImage *thumbImage = [UIImage imageNamed:@"apple_thumb.png"];
    37 UIImage *minSliderImage = [UIImage imageNamed:@"apple_min.png"];
    38 UIImage *maxSliderImage = [UIImage imageNamed:@"apple_max.png"];
    39
    40 [mySlider setThumbImage:thumbImage forState:UIControlStateNormal];
    41 [mySlider setMinimumTrackImage:leftTrackImage forState:UIControlStateNormal];
    42 [mySlider setMaximumTrackImage:rightTrackImage forState:UIControlStateNormal];
    43 [mySlider setMinimumValueImage:minSliderImage];
    44 [mySlider setMaximumValueImage:maxSliderImage];
    45 [mySlider setValue:50.0f];
    46
    47 //handle value change events
    48 [mySlider addTarget:self action:@selector(sliderAction:) forControlEvents:UIControlEventValueChanged];
    49
    50 //label to show current value
    51 CGRect lblRect = CGRectMake(145,100,100,20);
    52 lblSliderValue = [[UILabel alloc] initWithFrame:lblRect];
    53 lblSliderValue.backgroundColor = [UIColor clearColor];
    54
    55 lblSliderValue.text = [NSString stringWithFormat:@"%d",(int)mySlider.value];
    56
    57 //add slider to main view
    58 [self.view addSubview:mySlider];
    59 [self.view addSubview:lblSliderValue];
    60
    61 [lblSliderValue release];
    62 [mySlider release];
    63 }
    64
    65 - (void)didReceiveMemoryWarning {
    66 // Releases the view if it doesn't have a superview.
    67 [super didReceiveMemoryWarning];
    68
    69 // Release any cached data, images, etc that aren't in use.
    70 }
    71
    72 - (void)viewDidUnload {
    73 // Release any retained subviews of the main view.
    74 // e.g. self.myOutlet = nil;
    75 }
    76
    77
    78 - (void)dealloc {
    79 [super dealloc];
    80 }
    81
    82 @end
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  • 原文地址:https://www.cnblogs.com/foxmin/p/2393637.html
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