iOS-UISegmentedControl-隐藏边框

原理: 

1. 用tintColor属性,把整个UISEgmentControl 设置成为透明色.

2. 设置正常状态下的titleTextAttributes.和选中状态下的titleTextAttributes.

#import "SecondViewController.h"
#import "Masonry.h"

@interface SecondViewController ()

@property (nonatomic, strong) UISegmentedControl * segmentedControl_one;

@end

@implementation SecondViewController

#pragma mark - 生命周期
#pragma mark viewDidLoad
- (void)viewDidLoad
{
    [super viewDidLoad];
    
    [self basicSetting];
    
    [self addSegmentedControl_one];
    
}

#pragma mark - 系统代理

#pragma mark - 点击事件
- (void)segmentedControl_one:(UISegmentedControl *)sender
{
    NSLog(@"index: %ld",(long)sender.selectedSegmentIndex);
    
}

#pragma mark - 实现方法
#pragma mark 基本设置
- (void)basicSetting
{
    self.title = @"隐藏边框";
}

- (void)addSegmentedControl_one
{
    [self.view addSubview:self.segmentedControl_one];
    [self.segmentedControl_one mas_makeConstraints:^(MASConstraintMaker *make) {
        
        make.left.mas_equalTo(self.view).with.offset(10);
        make.right.mas_equalTo(self.view).with.offset(-10);
        make.top.mas_equalTo(self.view).with.offset(30);
        make.height.mas_equalTo(40);
    }];
}


#pragma mark - setter & getter
- (UISegmentedControl *)segmentedControl_one
{
    if (!_segmentedControl_one)
    {
        NSArray * array = @[@"第一段",@"第二段",@"第三段",@"第四段"];
        self.segmentedControl_one = [[UISegmentedControl alloc] initWithItems:array];
        
        // 去掉颜色,现在整个segment偶看不到,可以相应点击事件
        self.segmentedControl_one.tintColor = [UIColor clearColor];
        
        // 正常状态下
        NSDictionary * normalTextAttributes = @{NSFontAttributeName : [UIFont systemFontOfSize:16.0f],NSForegroundColorAttributeName : [UIColor grayColor]};
        [self.segmentedControl_one setTitleTextAttributes:normalTextAttributes forState:UIControlStateNormal];
        
        // 选中状态下
        NSDictionary * selctedTextAttributes = @{NSFontAttributeName : [UIFont boldSystemFontOfSize:20.0f],NSForegroundColorAttributeName : [UIColor redColor]};
        [self.segmentedControl_one setTitleTextAttributes:selctedTextAttributes forState:UIControlStateSelected];
        
        
        [self.segmentedControl_one addTarget:self action:@selector(segmentedControl_one:) forControlEvents:UIControlEventValueChanged];
    }
    return _segmentedControl_one;
}

@end