typedef enum{
LineTypeNone,//没有画线
LineTypeUp ,// 上边画线
LineTypeMiddle,//中间画线
LineTypeDown,//下边画线
} LineType ;
@interface QFLineLabel : UILabel
//样式
@property (assign, nonatomic) LineType lineType;
//颜色
@property (assign, nonatomic) UIColor * lineColor;
#import "QFLineLabel.h"
@implementation QFLineLabel
- (void)dealloc{
self.lineColor = nil;
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
}
*/
- (void)drawTextInRect:(CGRect)rect{
[super drawTextInRect:rect];
//文字宽度
CGSize textSize = [[self text] sizeWithFont:[self font]];
CGFloat strikeWidth = textSize.width;
CGRect lineRect;
CGFloat origin_x;
CGFloat origin_y;
if ([self textAlignment] == NSTextAlignmentRight) {
origin_x = rect.size.width - strikeWidth;
} else if ([self textAlignment] == NSTextAlignmentCenter) {
origin_x = (rect.size.width - strikeWidth)/2 ;
} else {
origin_x = 0;
}
if (self.lineType == LineTypeUp) {
origin_y = 2;
}
if (self.lineType == LineTypeMiddle) {
origin_y = rect.size.height/2;
}
if (self.lineType == LineTypeDown) {//下画线
origin_y = rect.size.height - 2;
}
lineRect = CGRectMake(origin_x , origin_y, strikeWidth, 1);
if (self.lineType != LineTypeNone) {
CGContextRef context = UIGraphicsGetCurrentContext();
CGFloat R, G, B, A;
UIColor *uiColor = self.lineColor;
CGColorRef color = [uiColor CGColor];
int numComponents = CGColorGetNumberOfComponents(color);
if( numComponents == 4)
{
const CGFloat *components = CGColorGetComponents(color);
R = components[0];
G = components[1];
B = components[2];
A = components[3];
CGContextSetRGBFillColor(context, R, G, B, 1.0);
}
//填充矩形
CGContextFillRect(context, lineRect);
}
}
@end
