ios之自定义UISwitch

系统自带的UISwitch是这样的：

 

既不能写字，也不能改颜色，于是在网上找到了这么一个自定义的Switch按钮，具体出处找不见了。记录一下，怕以后找不见了。

先看下效果图：

按钮的样式很多，可以文字，可以写多行，文字大小和颜色都可以设置。

看下它的源码：

 

#import <Foundation/Foundation.h>


@interface HMCustomSwitch : UISlider {
    BOOL on;
    UIColor *tintColor;
    UIView *clippingView;
    UILabel *rightLabel;
    UILabel *leftLabel;

    // private member
    BOOL m_touchedSelf;
}

@property(nonatomic,getter=isOn) BOOL on;
@property (nonatomic,retain) UIColor *tintColor;
@property (nonatomic,retain) UIView *clippingView;
@property (nonatomic,retain) UILabel *rightLabel;
@property (nonatomic,retain) UILabel *leftLabel;

+ (HMCustomSwitch *) switchWithLeftText: (NSString *) tag1 andRight: (NSString *) tag2;

- (void)setOn:(BOOL)on animated:(BOOL)animated;

 

 

.m文件

#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。

如何在代码中使用它呢？很简单：

 

- (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
World" andRight:@"Bye
World"];
    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"));

}

 

代码下载地址：https://github.com/schelling/HMCustomSwitch