iOS--弹出视图后使window背景变暗
实现思路解析：
1，首先要拿到window (方式有多重可以app delegate,或者创建window、keywindow等等方式)
2， 然后创建一个backgroundView，使其frame和window相等，设置背景颜色，再添加到window上。
3，把需要显示的view添加到backgroundView上，当然有动画效果更好
下边的 “弹出视图”和“关闭视图”就是对显示在window上的视图的操作
1. 弹出视图
/**显示弹出视图*/
- (void)show{
//1. 取出window
UIWindow * window = [[UIApplication sharedApplication] keywindow];
//[[[UIApplication sharedApplication] windows] firstObject];有时这样取window会加载不出我们需要的试图，这是因为不是keywindow，比如用storyboard画的试图，推荐用keywindow不论什么情况包不会出问题。
//2. 创建背景视图
_bgView = [[UIView alloc]init];
_bgView.frame = window.bounds;
//3. 背景颜色可以用多种方法看需要咯
_bgView.backgroundColor = [[UIColor blackColor]colorWithAlphaComponent:0.4];
// _bgView.backgroundColor = [UIColor colorWithWhite:0.1 alpha:0.6];
[window addSubview:_bgView];
//4. 把需要展示的控件添加上去
[window addSubview:self];
//5. 动画简单(low)
[UIView animateWithDuration:0.3 animations:^{
_pickerView.transform = CGAffineTransformMakeScale(1.0, 1.0);
}];
}
2. 关闭视图
/**关闭弹出视图*/
- (void) hidden {
[UIView animateWithDuration:0.3 animations:^{
_pickerView.transform = CGAffineTransformMakeScale(0.001, 0.002);
} completion:^(BOOL finished) {
[_pickerView removeFromSuperview];
_pickerView = nil;
[self removeFromSuperview];
[_bgView removeFromSuperview];
_bgView = nil;
}];
}下边是我简单封装的PickerView
以上是我简单封装的PickerView的显示，下边是具体的demo也可以记录一下，具体代码见下:
1. pickerView.h文件
#import pickerView.m
#import "LLPIckerView.h"
#define margin 40
#define pickerViewWith [UIScreen mainScreen].bounds.size.width - 2*margin
#define pickerViewHeight 260
@interface LLPIckerView ()<UIPickerViewDataSource,UIPickerViewDelegate>
@property (nonatomic, strong) NSMutableArray *dataArray;
@end
@implementation LLPIckerView
{
UIPickerView * _pickerView;//滚筒
NSString * _selecteTitel;//记录选中人数
UIView * _bgView;//大背景
}
//初始化数据源数组
- (NSMutableArray *)dataArray{
if (_dataArray == nil) {
_dataArray = @[].mutableCopy;
}
return _dataArray;
}
/**构建*/
- (LLPIckerView *)initWithFrame:(CGRect)pickerViewFrame rowCount:(NSInteger)rowCount withSelectedComplete:(selectedTitle)selecteBlock{
if (self = [super initWithFrame:pickerViewFrame]) {
//忽略传过来的frame
self.layer.cornerRadius = 5;
_pickerView = [[UIPickerView alloc]initWithFrame:CGRectMake(0, 0, pickerViewWith, pickerViewHeight)];
_pickerView.delegate = self;
_pickerView.dataSource = self;
[self addSubview:_pickerView];
//确认按钮
UIButton *confirmButton = [UIButton buttonWithType:UIButtonTypeCustom];
confirmButton.frame = CGRectMake(pickerViewWith - 100, pickerViewHeight, 80, margin);
[confirmButton setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal];
[confirmButton addTarget:self action:@selector(confirmButtonClick) forControlEvents:UIControlEventTouchUpInside];
[confirmButton setTitle:@"确认" forState:UIControlStateNormal];
[self addSubview:confirmButton];
//取消按钮
UIButton * cancelButton = [UIButton buttonWithType:UIButtonTypeCustom];
cancelButton.frame = CGRectMake(20, pickerViewHeight, 80, margin);
[cancelButton setTitle:@"取消" forState:UIControlStateNormal];
[cancelButton addTarget:self action:@selector(hidden) forControlEvents:UIControlEventTouchUpInside];
[cancelButton setTitleColor:[UIColor lightGrayColor] forState:UIControlStateNormal];
[self addSubview:cancelButton];
self.frame = CGRectMake(0, 0, pickerViewWith, pickerViewHeight + margin);
self.center = [[UIApplication sharedApplication] keyWindow].center;
self.backgroundColor = [UIColor whiteColor];
}
//提示标签
UILabel * titleLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 10, pickerViewWith, 20)];
titleLabel.font = [UIFont systemFontOfSize:18];
[self addSubview:titleLabel];
if (rowCount>0) {
//这里仅传入数字 表示有多少人
titleLabel.text = [NSString stringWithFormat:@"当前餐桌最多可坐%ld人!",rowCount];
for (int i = 0; iself.dataArray addObject:[NSString stringWithFormat:@"%d",i]];
}
}
_selectedBlock = selecteBlock;//保存block
return self;
}
/**确认按钮被点击*/
- (void)confirmButtonClick{
if (self.selectedBlock) {
if (!_selecteTitel) {
_selecteTitel = @"0";
}
self.selectedBlock(_selecteTitel);
}
[self hidden];
}
#pragma mark - pickerView delegate
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
return self.dataArray.count;
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
return self.dataArray[row];
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
_selecteTitel = self.dataArray[row];
}
/**显示弹出视图*/
- (void)show{
UIWindow * window = [[UIApplication sharedApplication] keywindow];
_bgView = [[UIView alloc]init];
_bgView.frame = window.bounds;
_bgView.backgroundColor = [[UIColor blackColor]colorWithAlphaComponent:0.4];
// _bgView.backgroundColor = [UIColor colorWithWhite:0.1 alpha:0.6];
[window addSubview:_bgView];
[window addSubview:self];
[UIView animateWithDuration:0.3 animations:^{
_pickerView.transform = CGAffineTransformMakeScale(1.0, 1.0);
}];
}
/**关闭弹出视图*/
- (void) hidden {
[UIView animateWithDuration:0.3 animations:^{
_pickerView.transform = CGAffineTransformMakeScale(0.001, 0.002);
} completion:^(BOOL finished) {
[_pickerView removeFromSuperview];
_pickerView = nil;
[self removeFromSuperview];
[_bgView removeFromSuperview];
_bgView = nil;
}];
}
@end ViewController中
#import "ViewController.h"
#import "LLPIckerView.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(200, 200, 50, 30);
button.backgroundColor = [UIColor redColor];
[self.view addSubview:button];
[button addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];
}
- (void)buttonClick{
LLPIckerView * picker = [[LLPIckerView alloc]initWithFrame:CGRectZero rowCount:10 withSelectedComplete:^(NSString *indexTitle) {
NSLog(@"选中的title:%@",indexTitle);
}];
[picker show];
}
@end