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iOS开发中UISwitch按钮的使用方法简介

柯建修
2023-03-14
本文向大家介绍iOS开发中UISwitch按钮的使用方法简介,包括了iOS开发中UISwitch按钮的使用方法简介的使用技巧和注意事项,需要的朋友参考一下

一、第一种创建UISwitch控件的方法,在代码中动态创建。
1、打开Xcode  4.3.2, 新建项目Switch,选择Single View Application。
2、打开ViewController.m文件在viewDidLoad方法里添加代码:


- (void)viewDidLoad

{

    [super viewDidLoad];

    UISwitch *switchButton = [[UISwitch alloc] initWithFrame:CGRectMake(50, 100, 20, 10)];

    [switchButton setOn:YES];

    [switchButton addTarget:self action:@selector(switchAction:) forControlEvents:UIControlEventValueChanged];

    [self.view addSubview:switchButton];

    

 // Do any additional setup after loading the view, typically from a nib.

}


代码中selector中的switchAction:需要我们自己实现,就是按下时接收到的事件。
记得把switchButton加到当前view,调用[self.viewaddSubview:switchButton];
3、监听UISwitch按下事件
实现代码如下:

-(void)switchAction:(id)sender

{

    UISwitch *switchButton = (UISwitch*)sender;

    BOOL isButtonOn = [switchButton isOn];

    if (isButtonOn) {

        showSwitchValue.text = @"是";

    }else {

        showSwitchValue.text = @"否";

    }

}


showSwitchValue是我通过拖拽控件方法放到界面上的Label,方便显示效果
运行,效果:

二、通过拖拽方法使用UISwitch
1、往xib文件上拖拽一个UISwitch控件。

2、按alt+command + return键开启Assistant Editor模式,选中UISwitch控件,按住Control键,往ViewController.h拖拽

3、选Action方式

4、.m文件中实现switchAction 。刚才动态创建的时候也用到这个方法名称,可以先注释掉刚才的。


- (IBAction)switchAction:(id)sender {

    UISwitch *switchButton = (UISwitch*)sender;

    BOOL isButtonOn = [switchButton isOn];

    if (isButtonOn) {

        showSwitchValue.text = @"是";

    }else {

        showSwitchValue.text = @"否";

    }

}


这里我们来看一下.m文件的源码:

#import "HMCustomSwitch.h"

@implementation HMCustomSwitch

@synthesize on; @synthesize tintColor, clippingView, leftLabel, rightLabel;

+(HMCustomSwitch *)switchWithLeftText:(NSString *)leftText andRight:(NSString *)rightText {  HMCustomSwitch *switchView = [[HMCustomSwitch alloc] initWithFrame:CGRectZero];    switchView.leftLabel.text = leftText;  switchView.rightLabel.text = rightText;    return [switchView autorelease]; }

-(id)initWithFrame:(CGRect)rect {  if ((self=[super initWithFrame:CGRectMake(rect.origin.x,rect.origin.y,95,27)]))  {   //  self.clipsToBounds = YES;      [self awakeFromNib];  // do all setup in awakeFromNib so that control can be created manually or in a nib file  }  return self; }

-(void)awakeFromNib {  [super awakeFromNib];    self.backgroundColor = [UIColor clearColor];

 [self setThumbImage:[UIImage imageNamed:@"switchThumb.png"] forState:UIControlStateNormal];  [self setMinimumTrackImage:[UIImage imageNamed:@"switchBlueBg.png"] forState:UIControlStateNormal];  [self setMaximumTrackImage:[UIImage imageNamed:@"switchOffPlain.png"] forState:UIControlStateNormal];    self.minimumValue = 0;  self.maximumValue = 1;  self.continuous = NO;    self.on = NO;  self.value = 0.0;    self.clippingView = [[UIView alloc] initWithFrame:CGRectMake(4,2,87,23)];  self.clippingView.clipsToBounds = YES;  self.clippingView.userInteractionEnabled = NO;  self.clippingView.backgroundColor = [UIColor clearColor];  [self addSubview:self.clippingView];  [self.clippingView release];    NSString *leftLabelText = NSLocalizedString(@"ON","Custom UISwitch ON label. If localized to empty string then I/O will be used");  if ([leftLabelText length] == 0)   {   leftLabelText = @"l";  // use helvetica lowercase L to be a 1.  }    self.leftLabel = [[UILabel alloc] init];  self.leftLabel.frame = CGRectMake(0, 0, 48, 23);  self.leftLabel.text = leftLabelText;  self.leftLabel.textAlignment = NSTextAlignmentCenter;  self.leftLabel.font = [UIFont boldSystemFontOfSize:17];  self.leftLabel.textColor = [UIColor whiteColor];  self.leftLabel.backgroundColor = [UIColor clearColor];  //  self.leftLabel.shadowColor = [UIColor redColor];  //  self.leftLabel.shadowOffset = CGSizeMake(0,0);  [self.clippingView addSubview:self.leftLabel];  [self.leftLabel release];      NSString *rightLabelText = NSLocalizedString(@"OFF","Custom UISwitch OFF label. If localized to empty string then I/O will be used");  if ([rightLabelText length] == 0)   {   rightLabelText = @"O"; // use helvetica uppercase o to be a 0.  }    self.rightLabel = [[UILabel alloc] init];  self.rightLabel.frame = CGRectMake(95, 0, 48, 23);  self.rightLabel.text = rightLabelText;  self.rightLabel.textAlignment = NSTextAlignmentCenter;  self.rightLabel.font = [UIFont boldSystemFontOfSize:17];  self.rightLabel.textColor = [UIColor grayColor];  self.rightLabel.backgroundColor = [UIColor clearColor];  //  self.rightLabel.shadowColor = [UIColor redColor];  //  self.rightLabel.shadowOffset = CGSizeMake(0,0);  [self.clippingView addSubview:self.rightLabel];  [self.rightLabel release];     }

-(void)layoutSubviews {  [super layoutSubviews];    // NSLog(@"leftLabel=%@",NSStringFromCGRect(self.leftLabel.frame));    // move the labels to the front  [self.clippingView removeFromSuperview];  [self addSubview:self.clippingView];    CGFloat thumbWidth = self.currentThumbImage.size.width;  CGFloat switchWidth = self.bounds.size.width;  CGFloat labelWidth = switchWidth - thumbWidth;  CGFloat inset = self.clippingView.frame.origin.x;    // NSInteger xPos = self.value * (self.bounds.size.width - thumbWidth) - (self.leftLabel.frame.size.width - thumbWidth/2);  NSInteger xPos = self.value * labelWidth - labelWidth - inset;  self.leftLabel.frame = CGRectMake(xPos, 0, labelWidth, 23);    // xPos = self.value * (self.bounds.size.width - thumbWidth) + (self.rightLabel.frame.size.width - thumbWidth/2);  xPos = switchWidth + (self.value * labelWidth - labelWidth) - inset;  self.rightLabel.frame = CGRectMake(xPos, 0, labelWidth, 23);    // NSLog(@"value=%f    xPos=%i",self.value,xPos);  // NSLog(@"thumbWidth=%f    self.bounds.size.width=%f",thumbWidth,self.bounds.size.width); }

- (UIImage *)image:(UIImage*)image tintedWithColor:(UIColor *)tint {        if (tint != nil)  {   UIGraphicsBeginImageContext(image.size);      //draw mask so the alpha is respected   CGContextRef currentContext = UIGraphicsGetCurrentContext();   CGImageRef maskImage = [image CGImage];   CGContextClipToMask(currentContext, CGRectMake(0, 0, image.size.width, image.size.height), maskImage);   CGContextDrawImage(currentContext, CGRectMake(0,0, image.size.width, image.size.height), image.CGImage);      [image drawAtPoint:CGPointMake(0,0)];   [tint setFill];   UIRectFillUsingBlendMode(CGRectMake(0,0,image.size.width,image.size.height),kCGBlendModeColor);   UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();   UIGraphicsEndImageContext();            return newImage;     }     else  {         return image;     } }

-(void)setTintColor:(UIColor*)color {  if (color != tintColor)  {   [tintColor release];   tintColor = [color retain];      [self setMinimumTrackImage:[self image:[UIImage imageNamed:@"switchBlueBg.png"] tintedWithColor:tintColor] forState:UIControlStateNormal];  }   }

- (void)setOn:(BOOL)turnOn animated:(BOOL)animated; {  on = turnOn;    if (animated)  {   [UIView  beginAnimations:nil context:nil];   [UIView setAnimationDuration:0.2];  }    if (on)  {   self.value = 1.0;  }  else  {   self.value = 0.0;  }    if (animated)  {   [UIView commitAnimations];   } }

- (void)setOn:(BOOL)turnOn {  [self setOn:turnOn animated:NO]; }

- (void)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {  NSLog(@"preendTrackingWithtouch");  [super endTrackingWithTouch:touch withEvent:event];  NSLog(@"postendTrackingWithtouch");  m_touchedSelf = YES;    [self setOn:on animated:YES]; }

- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {  [super touchesBegan:touches withEvent:event];   NSLog(@"touchesBegan");  m_touchedSelf = NO;  on = !on; }

- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {  [super touchesEnded:touches withEvent:event];  NSLog(@"touchesEnded");    if (!m_touchedSelf)  {   [self setOn:on animated:YES];   [self sendActionsForControlEvents:UIControlEventValueChanged];  } }

-(void)dealloc {  [tintColor release];  [clippingView release];  [rightLabel release];  [leftLabel release];    [super dealloc]; }

@end


看代码可以知道,其实它是通过继承UISlider控件实现的,UISlider的左右分别是个UILabel,当YES的时候,滑块滑到了最右边,NO的时候滑到了最左边。
所以在代码中使用它呢?这里再举一个例子:

- (void)loadView

{

 UIView *contentView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];

 self.view = contentView;

 contentView.backgroundColor = [UIColor whiteColor];

 

 // Standard ON/OFF

 HMCustomSwitch *switchView = [[HMCustomSwitch alloc] initWithFrame:CGRectZero];

 switchView.center = CGPointMake(160.0f, 20.0f);

 switchView.on = YES;

 [contentView addSubview:switchView];

 [switchView release];

 

 // Custom YES/NO

 switchView = [HMCustomSwitch switchWithLeftText:@"YES" andRight:@"NO"];

 switchView.center = CGPointMake(160.0f, 60.0f);

 switchView.on = YES;

 [contentView addSubview:switchView];

 

 // Custom font and color

 switchView = [HMCustomSwitch switchWithLeftText:@"Hello " andRight:@"ABC "];

 switchView.center = CGPointMake(160.0f, 100.0f);

 switchView.on = YES;

 [switchView.leftLabel setFont:[UIFont boldSystemFontOfSize:13.0f]];

 [switchView.rightLabel setFont:[UIFont italicSystemFontOfSize:15.0f]];

 [switchView.rightLabel setTextColor:[UIColor blueColor]];

 [contentView addSubview:switchView];

 

 // Multiple lines

 switchView = [HMCustomSwitch switchWithLeftText:@"Hello\nWorld" andRight:@"Bye\nWorld"];

 switchView.center = CGPointMake(160.0f, 140.0f);

 switchView.on = YES;

 switchView.tintColor = [UIColor orangeColor];

 switchView.leftLabel.font = [UIFont boldSystemFontOfSize:9.0f];

 switchView.rightLabel.font = [UIFont boldSystemFontOfSize:9.0f];

 switchView.leftLabel.numberOfLines = 2;

 switchView.rightLabel.numberOfLines = 2;

 switchView.leftLabel.lineBreakMode = NSLineBreakByWordWrapping;

 switchView.rightLabel.lineBreakMode = NSLineBreakByWordWrapping;

 [contentView addSubview:switchView];

 

 switchView = [[HMCustomSwitch alloc] init];

 switchView.center = CGPointMake(160.0f, 180.0f);

 switchView.on = YES;

 switchView.tintColor = [UIColor purpleColor];

 [contentView addSubview:switchView];

 [switchView release];

 

 switchView = [HMCustomSwitch switchWithLeftText:@"l" andRight:@"O"];

 switchView.center = CGPointMake(160.0f, 220.0f);

// customSwitch.tintColor = [UIColor colorWithRed:125.f/255.f green:157.f/255.f blue:93.f/255.f alpha:1.0];

// customSwitch.tintColor = [UIColor colorWithRed:125.f/255.f green:157.f/255.f blue:93.f/255.f alpha:1.0];

 [contentView addSubview:switchView];

 // Standard ON/OFF  switchView = [[HMCustomSwitch alloc] init];  switchView.center = CGPointMake(160.0f, 260.0f);  switchView.tintColor = [UIColor colorWithRed:125.f/255.f green:157.f/255.f blue:93.f/255.f alpha:1.0];  [switchView addTarget:self action:@selector(switchFlipped:) forControlEvents:UIControlEventValueChanged];  [contentView addSubview:switchView];  [switchView release];        UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 420, 320, 40)];  toolbar.tintColor = [UIColor colorWithRed:125.f/255.f green:157.f/255.f blue:93.f/255.f alpha:1.0];  [contentView addSubview:toolbar];    [contentView release]; }

-(void)switchFlipped:(HMCustomSwitch*)switchView {  NSLog(@"switchFlipped=%f  on:%@",switchView.value, (switchView.on?@"Y":@"N"));   }

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