.m文件

#import "Start.h"

@implementation Start

-(void)setPercent:(CGFloat)percent

{

_percent = percent;

[self setNeedsDisplay];

}

-(void)drawRect:(CGRect)rect

{

[super drawRect:rect];

UIImage *image = [UIImage imageNamed:@"start"];

for (int i = 0; i < 5; i++) {

CGRect newRect = CGRectMake(i*0.2*rect.size.width, 0, 0.2*rect.size.width, rect.size.height );

[image drawInRect:newRect];

}

[[UIColor whiteColor] set];

UIRectFillUsingBlendMode(rect, kCGBlendModeSourceIn);

CGRect newRect= CGRectMake(0, 0, self.percent*rect.size.width, rect.size.height);

[[UIColor orangeColor] set];

UIRectFillUsingBlendMode(newRect, kCGBlendModeSourceIn);

}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

CGFloat xPoint = [[touches anyObject]locationInView:self].x;

[self setPercent:xPoint/self.bounds.size.width];

}

@end

.h文件

#import

@interface Start : UIView

@property(nonatomic,assign)CGFloat percent;

@end

demo代码地址：https://yunpan.cn/cReHb4CSMdtdj （提取码：5cd5）