自定义排序按钮

#import <UIKit/UIKit.h>

typedef  void(^DropBtnClickBlock)(BOOL isSeelect);

@interface DropBtn : UIButton

@property (nonatomic,strong) NSString *title;

@property (nonatomic,strong) UIImageView  *upOrDownImg;

@property (nonatomic,copy)   DropBtnClickBlock btnClickBlock;
@end

#import "DropBtn.h"
#define RGB(r,g,b)                  [UIColor colorWithRed:r/255.0 green:g/255.0 blue:b/255.0 alpha:1.0]

@implementation DropBtn

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        _title=[[NSString alloc]init];
        _upOrDownImg=[[UIImageView alloc]init];
        _upOrDownImg.image=[UIImage imageNamed:@"yzp_data_dropdown.png"];
        _upOrDownImg.frame=CGRectMake(self.frame.size.width-20-8, (frame.size.height-5)/2, 8, 5);
        [self addSubview:_upOrDownImg];
        [self addTarget:self action:@selector(btnClickHandle:) forControlEvents:UIControlEventTouchUpInside];
        
    }
    return self;
}
-(void)drawRect:(CGRect)rect
{
    [super drawRect:rect];
    //计算出字符串的frame
    NSDictionary *attributes=@{NSFontAttributeName: [UIFont systemFontOfSize:20.f],NSForegroundColorAttributeName:RGB(26, 26, 26)};
    CGRect frame=[_title boundingRectWithSize:CGSizeMake(MAXFLOAT, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil];
    [_title drawAtPoint:CGPointMake((self.bounds.size.width-8-frame.size.width-20)/2, (self.bounds.size.height-frame.size.height)/2) withAttributes:attributes];
}

-(void)btnClickHandle:(id)sender
{
    UIButton *btn=(UIButton *)sender;
    btn.selected=!btn.selected;
    _btnClickBlock(btn.selected);
}
-(void)setSelected:(BOOL)selected
{
    [super setSelected:selected];
    if (!selected) {
        _upOrDownImg.image=[UIImage imageNamed:@"yzp_data_dropdown.png"];
    }
    else
    {
        _upOrDownImg.image=[UIImage imageNamed:@"yzp_data_dropback.png"];
    }
    
}

@end

 DropBtn *dropBtn=[[DropBtn alloc]initWithFrame:CGRectMake(0, 44, self.view.bounds.size.width/2, 60)];
    dropBtn.title=@"价格";
    dropBtn.backgroundColor=[UIColor yellowColor];
    dropBtn.btnClickBlock=^(BOOL isSelected)
    {
        
    };
    [self.view addSubview:dropBtn];