WeChat/BAQMUIDemo/BALib/LBXScan/LBXScanVideoZoomView.m
//
//  LBXScanVideoZoomView.m
//  testSlider
//
//  Created by csc on 16/3/19.
//  Copyright © 2016年 csc. All rights reserved.
//

#import "LBXScanVideoZoomView.h"



@interface LBXScanVideoZoomView()
@property (nonatomic, strong) UISlider *slider;
@end

@implementation LBXScanVideoZoomView


// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
    
    UIColor *colorLine = [UIColor whiteColor];
    
    
    CGColorRef color = colorLine.CGColor;
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    CGContextSetStrokeColorWithColor(ctx, color);
    CGContextSetLineWidth(ctx, 2.0);
    
    
    CGFloat borderDiff = 20;
    CGFloat w = borderDiff/2;
    CGFloat diff = 5;
    //左边减号
    CGContextMoveToPoint(ctx, diff, CGRectGetHeight(self.frame)/2);
    CGContextAddLineToPoint(ctx, diff + w, CGRectGetHeight(self.frame)/2);
    
    //右边加号
    //横
    CGFloat rx = CGRectGetWidth(self.frame) - borderDiff + diff;
    CGContextMoveToPoint(ctx, rx, CGRectGetHeight(self.frame)/2);
    CGContextAddLineToPoint(ctx, rx + w, CGRectGetHeight(self.frame)/2);
    
    //竖
    CGFloat hDiff = CGRectGetHeight(self.frame)/2 - w/2;
    CGContextMoveToPoint(ctx, rx+w/2 , hDiff);
    CGContextAddLineToPoint(ctx, rx+w/2, CGRectGetHeight(self.frame)-hDiff);
    
    
    CGContextStrokePath(ctx);
}

- (UIImage *) toImage:(UIColor*)color size:(CGSize)size
{
    CGRect rect=CGRectMake(0.0f, 0.0f, size.width, size.height);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    
    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return theImage;
}

- (id)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
    }
    
    self.backgroundColor = [UIColor colorWithRed:10 green:10 blue:10 alpha:0.2];
    [self.slider setThumbImage:[self toImage:[UIColor whiteColor] size:CGSizeMake(3, 12)] forState:UIControlStateNormal];
    self.slider.minimumTrackTintColor = [UIColor whiteColor];
    self.slider.maximumTrackTintColor = [UIColor colorWithRed:146/255.0 green:146/255.0 blue:146/255.0 alpha:1.0];
    [self.slider addTarget:self action:@selector(sliderValueChange) forControlEvents:UIControlEventValueChanged];
    
    self.layer.masksToBounds = YES;
    self.layer.cornerRadius = 8.0;
    
    return self;
}

- (void)sliderValueChange
{
//    NSLog(@"%f",self.slider.value);
    
    if (_block) {
        _block(self.slider.value);
    }
}

//- (void)addTarget:(nullable id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents;

- (UISlider*)slider
{
    if (!_slider) {
        
        _slider = [[UISlider alloc]init];
        [self addSubview:_slider];
        _slider.minimumValue = 1.0;
        _slider.maximumValue = 50.0;
    }
    return _slider;
}

- (void)setMaximunValue:(CGFloat)value
{
    self.slider.maximumValue = value;
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    
    CGFloat borderDiff = 20;
    
    _slider.bounds = CGRectMake(0, 0, CGRectGetWidth(self.frame)-borderDiff*2, CGRectGetHeight(self.frame));
    _slider.center = CGPointMake(CGRectGetWidth(self.frame)/2, CGRectGetHeight(self.frame)/2);
}

@end


