JSJP_School/LN_School/STSegView.m

//

#import "STSegView.h"

#define lineColor [UIColor colorWithWhite:.3 alpha:.1]
#define subTitleColor [UIColor colorWithWhite:.3 alpha:1]

@interface STSegView()
{
    NSMutableArray* btns;
    
    UIView *bar;
}
@end

@implementation STSegView

-(instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        _colorNormal = subTitleColor;
        _colorSelected = RQMianColor;
        _barColor = RQMianColor;
        _font = 14;
        
        btns = [NSMutableArray array];
        
        [self addSelfViewWithRect:CGRectMake(0, self.height, self.width, 1) Color:lineColor];
        
        bar = [[UIView alloc] initWithFrame:CGRectMake(0, self.height-2, self.width, 3)];
        [self addSubview:bar];
    }
    return self;
}

-(void)setTitles:(NSArray *)titles
{
    if (!titles) {
        return;
    }
    
    UIButton* btn;
    /**这里只需要保证。btn的数量足够即可。
     */
    NSInteger tag = btns.count;
    for (int i=0; i<(titles.count - _titles.count); i++) {
        btn = [[UIButton alloc] init];
        [self addSubview:btn];
        [btns addObject:btn];
        [btn target:self];
        [btn setTag:tag++];
    }
    bar.width = self.width / titles.count;
    _titles = titles;
}

-(void)layoutSubviews
{
    [super layoutSubviews];
    
    if (!_titles) {
        return;
    }
    [bar setBackgroundColor:_barColor];
    
    CGFloat y,w,h;
    w = self.width * 1.0 / _titles.count;
    h = self.height;
    y = 0;
    UIButton* btn;
    for (int i =0; i < _titles.count; i++) {
        btn = btns[i];
        
        [btn setFrame:CGRectMake(w*i, y, w, h)];
        [btn setTitleNormal:_titles[i]];
        [btn setTitle:_titles[i] textColor:_colorNormal font:_font fotState:UIControlStateNormal];
        [btn setTitleColor:_colorSelected forState:UIControlStateSelected];
    }
}

-(void)click:(MyBlockType)block
{
    clkBlock = block;
}

-(void)setSelectedIndex:(NSInteger)selectedIndex
{
    if (selectedIndex > _titles.count -1) {
        selectedIndex = _titles.count -1;
    }
    if (selectedIndex < 0 ) {
        selectedIndex = 0;
    }
    _selectedIndex = selectedIndex;
    
    if (clkBlock) {
        clkBlock([NSString stringWithFormat:@"%d",(int)selectedIndex]);
    }else  if ([_delegate respondsToSelector:@selector(didSelectedIndex:)]) {
        [_delegate didSelectedIndex:selectedIndex];
    }
    
    if (!_titles || _titles.count < 1) {
        return;
    }
    
    UIButton* btn ;
    for (btn in btns) {
        [btn setSelected:NO];
    }
    
    btn = btns[selectedIndex];
    [btn setSelected:YES];
    
    [UIView animateWithDuration:.15 animations:^{
        bar.x = selectedIndex * bar.width;
    }];
}

-(void)btnClick:(UIButton*)sender
{
    int tag = (int)sender.tag;
    self.selectedIndex = tag;
}

@end