#import "HollowOutLabel.h"

@implementation HollowOutLabel

{

NSString * _text;

UIFont * _font;

UIColor * _backgroundColor;

CGRect _frame;

}

#pragma mark - 重寫對應的set方法

- (void)setText:(NSString *)text

{

_text = text;

}

- (void)setFont:(UIFont *)font

{

_font = font;

}

- (void)setBackgroundColor:(

{

_backgroundColor = backgroundColor;

}

//這個方法會出問題，因而重寫置空

- (void)sizeToFit

{

}

- (instancetype)init//禁止使用此方法初始化

{

returnnil;

}

- (instancetype)initWithFrame:(CGRect)frame

{

if (self = [superinitWithFrame:frame]) {

_frame = frame;

    }

returnself;

}

#pragma mark -

- (void)drawRect:(CGRect)rect

{

CGContextRef context = UIGraphicsGetCurrentContext();

    [selfdrawSubtractedText:_textinRect:_frameinContext:context];

}

- (void)drawSubtractedText:(NSString *)text inRect:(CGRect)rect inContext:(CGContextRef)context

{

//將當前圖形狀態推入堆疊

CGContextSaveGState(context);

//設定混合色

CGContextSetBlendMode(context, kCGBlendModeDestinationOut);

//label上面新增label

UILabel *label = [[UILabelalloc] initWithFrame:rect];

    label.font = _font;

    label.text = text;

    label.textAlignment = NSTextAlignmentCenter;

    label.backgroundColor = _backgroundColor;

    [label.layerdrawInContext:context];

//把堆疊頂部的狀態彈出，返回到之前的圖形狀態

CGContextRestoreGState(context);

}

@end