iOS UIPickerView 改变字体颜色，分割线颜色和尺寸

苹果选择器，还是比较方便使用的，但是每次，UI设计师都会有自己的独特见解，哈哈，有点意思。有一个开源的框架自定义程度还挺高的，好像是通过UITableView 来做的。还挺有意思的，大家可以去看看。传送门 -- PGDatePicker

下面针对UIPickerView 做一些调整，先看效果图。

下面是实现代码：Demo

原理：就是在复用的时候，进行修改。和 UITableView 自定义Cell 等类似。

- (UIView *)pickerView:(UIPickerView *)pickerView
            viewForRow:(NSInteger)row forComponent:(NSInteger)component
           reusingView:(UIView *)view{
    
    //普通状态的颜色
    UILabel* norLabel = (UILabel*)view;
    if (!norLabel){
        norLabel = [[UILabel alloc] init];
        norLabel.textColor = [UIColor grayColor];
        norLabel.adjustsFontSizeToFitWidth = YES;
        [norLabel setTextAlignment:NSTextAlignmentCenter];
        [norLabel setBackgroundColor:[UIColor blueColor]];
        [norLabel setFont:[UIFont systemFontOfSize:13]];
        
        //icon
        UIImageView *av = [[UIImageView alloc] initWithFrame:CGRectMake(30, 3, 20, 20)];
        av.image = [UIImage imageNamed:[NSString stringWithFormat:@"img_%d", (int)row%2]];
        [norLabel addSubview:av];
    }
    norLabel.text = [self pickerView:pickerView
                            titleForRow:row
                           forComponent:component];
    
    //当前选中的颜色
    UILabel *selLb = (UILabel*)[pickerView viewForRow:row forComponent:0];
    if (selLb) {
        selLb.textColor = [UIColor brownColor];
        selLb.adjustsFontSizeToFitWidth = YES;
        [selLb setTextAlignment:NSTextAlignmentCenter];
        [selLb setBackgroundColor:[UIColor purpleColor]];
        [selLb setFont:[UIFont systemFontOfSize:16]];
    }
    
    //下一个选中的颜色（为了选中状态不突兀，自己注释看看效果）
    UILabel *selLb1 = (UILabel*)[pickerView viewForRow:row + 1 forComponent:0];
    if (selLb1) {
        selLb1.textColor = [UIColor redColor];
        selLb1.adjustsFontSizeToFitWidth = YES;
        [selLb1 setTextAlignment:NSTextAlignmentCenter];
        [selLb1 setBackgroundColor:[UIColor greenColor]];
        [selLb1 setFont:[UIFont systemFontOfSize:16]];
    }
    
    //设置分割线
    for (UIView *line in pickerView.subviews) {
        if (line.frame.size.height < 1) {//0.6667
            line.backgroundColor = [UIColor blackColor];
            CGRect tempRect = line.frame;
            CGFloat lineW = 120;
            line.frame = CGRectMake((pickerView.frame.size.width - lineW) * 0.5, tempRect.origin.y, lineW, 2);
        }
    }
    
    return norLabel;
}