简陋的评分进度条动画

改变颜色
改变长度

使用drawRect方式构建所需UIview

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代码
Line.h

#import <UIKit/UIKit.h>@interface Line : UIView@property (nonatomic,assign) NSNumber *with;  //线宽@property (nonatomic,strong) UIColor  *color; //颜色@property (nonatomic,assign) float    star;   //评分@end

Line.m

#import "Line.h"#define kscreenHeight (self.frame.size.height)#define kscreenWidth  (self.frame.size.width)@interface Line(){    CGContextRef   _context;    CADisplayLink *_displayLink;    float          _addfloat;     //添加数值    float          _curretnfloat; //当前数值    float          _jianfloat;    //减去数值    float          _starNum;}@end@implementation Line-(instancetype)initWithFrame:(CGRect)frame{    if ([super initWithFrame:frame]) {        [self setCADisplayLink];        _curretnfloat = 0;    }return self;}-(void)setCADisplayLink{    _addfloat = 0;    _jianfloat = 100;    _displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(changeValue)];    [_displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];}-(void)setInit{    _with = @(15);    _color = [UIColor orangeColor];}-(void)drawRect:(CGRect)rect{    //初始化    _context = UIGraphicsGetCurrentContext();    [self setInit];    CGContextSaveGState(_context);    CGContextSetLineWidth(_context, [_with doubleValue]);    CGContextSetLineCap(_context, kCGLineCapRound);    CGContextMoveToPoint(_context, 0, kscreenHeight/2);    CGContextAddLineToPoint(_context,_curretnfloat, kscreenHeight/2);    CGContextSetStrokeColorWithColor(_context, [UIColor colorWithRed:222/255.0 green:_jianfloat/255.0 blue:0/255.0 alpha:0.8].CGColor);    CGContextStrokePath(_context);    CGContextRestoreGState(_context);}-(void)setStar:(float)star{    _star = star;    _starNum = star;    _star  = _star/5 * self.frame.size.width;    NSLog(@"%f",_star);}-(void)changeValue{    //控制进度    if (_curretnfloat < _star) {        _addfloat = 3+_addfloat;        _curretnfloat = _addfloat;        _jianfloat = -0.7 + _jianfloat;          NSLog(@"%f",_jianfloat);    }else{        [_displayLink invalidate];    }    [self setNeedsDisplay];}- (UIColor *) hexStringToColor: (NSString *) stringToConvert{    NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];    // String should be 6 or 8 characters    if ([cString length] < 6) return [UIColor blackColor];    // strip 0X if it appears    if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];    if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1];    if ([cString length] != 6) return [UIColor blackColor];    // Separate into r, g, b substrings    NSRange range;    range.location = 0;    range.length = 2;    NSString *rString = [cString substringWithRange:range];    range.location = 2;    NSString *gString = [cString substringWithRange:range];    range.location = 4;    NSString *bString = [cString substringWithRange:range];    // Scan values    unsigned int r, g, b;    [[NSScanner scannerWithString:rString] scanHexInt:&r];    [[NSScanner scannerWithString:gString] scanHexInt:&g];    [[NSScanner scannerWithString:bString] scanHexInt:&b];    return [UIColor colorWithRed:((float) r / 255.0f)                           green:((float) g / 255.0f)                            blue:((float) b / 255.0f)                           alpha:1.0f];}@end

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GitHUb
https://github.com/tianNanYiHao/MyTestDemo.git