高度自定义的STDPickerView

年前的某天,公司的UI拿了张设计图让我看下能否实现,随意一瞥发现只是个PickerView,心想着用UIPickerView封装一下还不是so easy的事情,然而接下去了解了需求后才发现没那么简单......

需要实现的效果

具体需求如下:

需要能自定义选中颜色及未选中颜色,且跟随滚动实时变化;

需要能自定义选中指示器;

需要滚动效果是平面滚动;

根据上面的需求,翻看了下UIPickerView的接口并写代码测试了下后发现情况不容乐观:

UIPickerView默认不支持选中颜色设置,可通过自定义view实现,但是无法跟随滚动实时变化;

UIPickerView原生不支持设置选中指示器样式;

UIPickerView默认滚动效果为类曲面滚动,且不支持设置;

到现在已经基本确定UIPickerView的方案已经被毙了,不过没关系,原生没法实现那么就自己实现一个,于是 STDPickerView 就在这种情况下诞生了:

STDPickerView 是什么

STDPickerView 是基于 UICollectionView 封装的选择控件,兼容UIPickerView大部分接口,并增加了多个定制化接口,可实现更多的效果!STDPickerView 效果图如下:

默认样式

分割选中指示器

垂直分割线

自定义view

STDPickerView 怎么使用

初始化

STDPickerView *pickerView = [[STDPickerView alloc] init];

pickerView.dataSource =self;

pickerView.delegate =self;

/*

STDPickerViewSelectionIndicatorStyleNone:无选中指示器

STDPickerViewSelectionIndicatorStyleDefault:默认选中指示器

STDPickerViewSelectionIndicatorStyleDivision: 分段选中指示器

STDPickerViewSelectionIndicatorStyleCustom:自定义选中指示器,需实现 selectionIndicatorViewInPickerView: 代理方法

*/

pickerView.selectionIndicatorStyle = STDPickerViewSelectionIndicatorStyleDefault;

/*

默认情况下,如果同时实现了titleForRow以及viewForRow数据源方法,

则会优先使用viewForRow方法返回自定义view,

此时可设置 forceItemTypeText = YES 来指定使用titleForRow方法

*/

pickerView.forceItemTypeText =YES;

//是否显示垂直分割线

pickerView.showVerticalDivisionLine =YES;

//设置pickerView四周的间距

pickerView.edgeInsets =UIEdgeInsetsMake(,20,,20);

//设置component之间的间距

pickerView.spacingOfComponents =30;

//仅在文本模式下有效

pickerView.textColor = kLightTextColor;

pickerView.selectedTextColor = kGlobalColor;

pickerView.font = [UIFontsystemFontOfSize:16];

...

[self.view addSubview:pickerView];

通用数据源及代理方法

#pragma mark - STDPickerViewDataSource

//返回component数目

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView

{

return1;

}

//返回row数目

- (NSInteger)pickerView:(STDPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component

{

returnself.items.count;

}

#pragma mark - STDPickerViewDelegate

//返回条目高度

- (CGFloat)pickerView:(STDPickerView *)pickerView rowHeightForComponent:(NSInteger)component

{

return60;

}

//选中了某个条目

- (void)pickerView:(STDPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component

{

NSLog(@"pickerView - didSelectRow %zd inComponent %zd", row, component);

}

//若selectionIndicatorStyle = STDPickerViewSelectionIndicatorStyleCustom,则需实现以下方法

- (UIView*)selectionIndicatorViewInPickerView:(STDPickerView *)pickerView

{

UIView*view = [[UIViewalloc] init];

view.backgroundColor = kGlobalColorWithAlpha(0.3);

view.layer.cornerRadius =5;

view.layer.masksToBounds =YES;

returnview;

}

...

默认选中样式

#pragma mark - STDPickerViewDataSource

//返回component数目

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView

{

return1;

}

//返回row数目

- (NSInteger)pickerView:(STDPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component

{

returnself.items.count;

}

#pragma mark - STDPickerViewDelegate

//返回条目高度

- (CGFloat)pickerView:(STDPickerView *)pickerView rowHeightForComponent:(NSInteger)component

{

return60;

}

#pragma mark - STDPickerViewDataSource

// 返回item的标题

(注:若同时实现了 pickerView: viewForRow:forComponent:reusingView: 优先采用后者,此时可通过设置 forceItemTypeText =YES来强制使用本方法)

- (NSString*)pickerView:(STDPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component

{

returnself.items[row];

}

自定义选中样式

#pragma mark - STDPickerViewDataSource

// 返回item的自定义view,优先级较高

(注:若同时实现了 pickerView: titleForRow:forComponent: 且 forceItemTypeText =YES则本方法无效)

- (UIView*)pickerView:(STDPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView*)view

{

UILabel*label = (UILabel*)view;

if(!label) {

label = [[UILabelalloc] init];

label.textAlignment =NSTextAlignmentCenter;

}

label.textColor = kLightTextColor;

label.transform =CGAffineTransformIdentity;

label.text =self.items[row];

returnlabel;

}

#pragma mark - STDPickerViewDelegate

//可在此方法及willDeselectRow中实现自定义的切换效果

- (void)pickerView:(STDPickerView *)pickerView willSelectRow:(NSInteger)row inComponent:(NSInteger)component

{

UILabel*label = (UILabel*)[pickerView viewForRow:row forComponent:component];

[UIViewanimateWithDuration:0.25animations:^{

label.transform =CGAffineTransformMakeScale(1.5,1.5);

}];

label.textColor = kGlobalColor;

}

- (void)pickerView:(STDPickerView *)pickerView willDeselectRow:(NSInteger)row inComponent:(NSInteger)component

{

UILabel*label = (UILabel*)[pickerView viewForRow:row forComponent:component];

[UIViewanimateWithDuration:0.25animations:^{

label.transform =CGAffineTransformIdentity;

}];

label.textColor = kLightTextColor;

}

目前 STDPickerView 已经开源到GitHub上并支持CocoaPods集成,欢迎大家下载与star!

GitHub: https://github.com/XuQibin/STDPickerView

作者:XuQibin

链接:https://www.jianshu.com/p/c3f489db8283

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  • 原文链接https://kuaibao.qq.com/s/20180706B0OU4700?refer=cp_1026
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