Ios UILabel plus strikethrough

First, generate a class that inherits from UILabel SFPStrikeThroughAndUnderLineLabel

1. In the. h file

@ Interface SFPStrikeThroughAndUnderLineLabel: UILabel

{

BOOL _ isWithStrikeThrough;

}

@ Property (nonatomic, assign) BOOL isWithStrikeThrough; // controls whether to display strikethrough.

@ Property (nonatomic, assign) CGFloat strikeThroughLineWidth; // you can specify the strikethrough width.

@ Property (nonatomic, retain) NSArray * strikeThroughRGBAlphaArray; // sets the strikethrough color. The elements in the array are RGB and alpha values, which means that the array has four elements.

# Import "SFPStrikeThroughAndUnderLineLabel. h"

 

@ Implementation SFPStrikeThroughAndUnderLineLabel

@ Synthesize isWithStrikeThrough = _ isWithStrikeThrough;

@ Synthesize strikeThroughRGBAlphaArray = _ strikeThroughRGBAlphaArray;

@ Synthesize strikeThroughLineWidth = _ strikeThroughLineWidth;

 

-(Id) initWithFrame :( CGRect) frame

{

Self = [super initWithFrame: frame];

If (self ){

// Initialization code

Self. strikeThroughRGBAlphaArray = [[NSArrayalloc] initWithObjects: @ "0", @ "0", @ "0", @ "1", nil]; // by default, the color of the strikethrough is black and non-transparent. a default value is provided. This attribute does not need to be assigned a value when an object is created.

Self. strikeThroughLineWidth = 1; // The default strikethrough width is 1pix

}

Returnself;

}

 

 

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

-(Void) drawRect :( CGRect) rect

{

// Drawing code

If (self. isWithStrikeThrough) // display strikethrough

{

CGContextRef c = UIGraphicsGetCurrentContext ();

CGFloat color [4] = {[self. strikethroughrgbalph?rayobjectatindex: 0] floatValue], [[self. strikethroughrgbalph?rayobjectatindex: 1] floatValue], [[self. strikethroughrgbalph?rayobjectatindex: 2] floatValue], [[self. strikethroughrgbalph?rayobjectatindex: 3] floatValue]};

CGContextSetStrokeColor (c, color );

CGContextSetLineWidth (c, self. strikeThroughLineWidth );

CGContextBeginPath (c );

CGFloat halfWayUp = (self. bounds. size. height-self. bounds. origin. y)/2.0;

CGContextMoveToPoint (c, self. bounds. origin. x, halfWayUp );

CGContextAddLineToPoint (c, self. bounds. origin. x + self. bounds. size. width, halfWayUp );

CGContextStrokePath (c );

}

[Super drawRect: rect];

}

3. Use: Add SFPStrikeThroughAndUnderLineLabel. h file

SFPStrikeThroughAndUnderLineLabel * oneLabel = [[SFPStrikeThroughAndUnderLineLabelalloc] initWithFrame: CGRectMake (20, 20,100,200)];

OneLabel. backgroundColor = [UIColorwhiteColor];

OneLabel. numberOfLines = 0;

OneLabel. text = @ "Zhu Dongling, I love you for 10 thousand years; Zhu Dongling, I love you for 10 thousand years; Zhu Dongling, I love you for 10 thousand years; Zhu Dongling, I love you for 10 thousand years; Zhu Dongling, I love you for 10 thousand years ";

OneLabel. isWithStrikeThrough = YES;

// The following two attributes can be set with no value, and all of them have default values.

// OneLabel. rgbAlphaArray = [NSArray arrayWithObjects: @ "255", @ "255", @ "0", @ "1", nil];

// OneLabel. strikeThroughLineWidth = 20;

[Self. view addSubview: oneLabel];

Note: This is to delete the entire UILabel control (a label only has one strikethrough), rather than adding strikethrough to the label text.