一、思路解析
充分利用button的select属性，设置button的选中及非选中状态。设置一个全局的选中button（当前选中的button），这样一个简单的单选功能就实现了。
二、具体源码
（1）准备工作：
@property (nonatomic,strong) UIView *SearchTopview;
@property (nonatomic,weak) UIButton *Selectbutton;
#pragma mark - getter and setter
- (UIView *)SearchTopview{
if (_SearchTopview == nil) {
_SearchTopview = [[UIView alloc] init];
_SearchTopview.frame = CGRectMake(0, 0, SCREEN_WIDTH, 100);
}
return _SearchTopview;
}
（2）首先一个for循环设置按钮
UILabel *lbTitle = [[UILabel alloc]init];
lbTitle.frame = CGRectMake(10, 0, SCREEN_WIDTH - 20, 30);
lbTitle.textAlignment = NSTextAlignmentLeft;
lbTitle.text = @"选择你要的搜索分类";
lbTitle.textColor = [UIColor grayColor];
lbTitle.font = HiraginoMidFONT;
[self.SearchTopview addSubview:lbTitle];
NSArray *titlearray = @[@"资讯",@"餐答",@"秀场",@"厨师",@"掌柜",@"秘籍",@"课堂",@"产品",@"悬赏",@"人物志"];
int col = 4;
int margin = 10;
for (int i = 0; i < titlearray.count; i++) {
int page = i/col;
int index = i%col;
UIButton *BtnSearch = [[UIButton alloc]initWithFrame:CGRectMake(margin + index*(SCREEN_WIDTH - (col + 1)*margin)/col + margin*index,40*page + 40,(SCREEN_WIDTH - (col + 1)*margin)/col,30 )];
BtnSearch.layer.cornerRadius = 5;
BtnSearch.layer.masksToBounds = YES;
BtnSearch.layer.shadowOffset = CGSizeMake(1, 1);
BtnSearch.layer.shadowOpacity = 0.8;
BtnSearch.layer.shadowColor = [UIColor blackColor].CGColor;
BtnSearch.backgroundColor = [UIColor lightGrayColor];
BtnSearch.tag = i;
[BtnSearch setTitle:titlearray[i] forState:UIControlStateNormal];
[BtnSearch setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[BtnSearch setTitleColor:BackyellowColor forState:UIControlStateSelected];
BtnSearch.titleLabel.font = HiraginoMidFONT;
[BtnSearch addTarget:self action:@selector(SelectBtnSearch:) forControlEvents:UIControlEventTouchUpInside];
if (i == 0) {
BtnSearch.backgroundColor = BackblackColor;
BtnSearch.selected = YES;
self.Selectbutton = BtnSearch;
}
[self.SearchTopview addSubview:BtnSearch];
}
self.SearchTopview.height = [CalculationTool rowWithcount:titlearray.count andcol:col]*40 + 45;
（3）按钮事件
#pragma mark - event
- (void)SelectBtnSearch:(UIButton *)Btn{
if (!Btn.isSelected) {
self.Selectbutton.selected = !self.Selectbutton.selected;
self.Selectbutton.backgroundColor = [UIColor lightGrayColor];
Btn.selected = !Btn.selected;
Btn.backgroundColor = BackblackColor;
self.Selectbutton = Btn;
}
}
（4）按钮事件 简述
if (!Btn.isSelected)：使点击当前按钮是不执行事件
self.Selectbutton.selected = !self.Selectbutton.selected; Btn.selected = !Btn.selected;
已经选中的按钮（self.Selectbutton）及当前点击按钮（Btn）的取反 使选中按钮为！select状态，单击按钮为selectt状态
self.Selectbutton = Btn; 所以现在的选中按钮就替换为你现在所点击的按钮了。
一个简单的单选按钮就实现了。 第一次尝试写文章分享，文笔啥的差了，欢迎点评，先来个简单的试试水哈、。