點擊button 字體跟着改變顏色

利用for循環創建5個button,其中對這個五個button一定要賦上tag值 ，因為下面的點擊操作我們要用到；

看for循環的代碼：

for (int i=0; i < 5; i++) {
        UIButton *button = [[UIButton alloc] init];
        button.frame = CGRectMake(10 + 60*i, 100, 50, 40);
        button.tag = 100 + i;
        [button setTitle:[NSString stringWithFormat:@"button%d",i] forState:UIControlStateNormal];
        [button setBackgroundColor:[UIColor lightGrayColor]];
        button.titleLabel.font = [UIFont systemFontOfSize:13];
        [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:button];
    }

在click:點擊方法中有  UIButton *btn = (UIButton *)[self.view viewWithTag:100+i] 這么一行代碼，是根據tag值獲取對應for循環中的某個button；

代碼如下：

 - (void)click:(UIButton *)sender {
    for (int i=0; i < 5; i++) {
        UIButton *btn = (UIButton *)[self.view viewWithTag:100+i];
        if (sender.tag - 100 == i) {
            [btn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
            [btn setBackgroundColor:[UIColor purpleColor]];

        }else{
            [btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
            [btn setBackgroundColor:[UIColor lightGrayColor]];

        }
    }
}