iOS 自动布局管理scrollview
#define MAS_SHORTHAND
#define MAS_SHORTHAND_GLOBALS
#define RGBColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1]
#define RGBAColor(r, g, b ,a) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:a]
#define RandColor RGBColor(arc4random_uniform(255), arc4random_uniform(255), arc4random_uniform(255))
#import "ViewController.h"
#import "Masonry.h"
@interface ViewController ()<UITextFieldDelegate,UIScrollViewDelegate>
@property(nonatomic,strong) UIScrollView *mainScroll;
@property(nonatomic,strong) UITextField *textField;
@property(nonatomic,strong) UIView *countView;
//@property(nonatomic,assign) BOOL keyBoardlsVisible;
@property(nonatomic,assign) CGFloat insetBottom;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 给 _keyBoardlsVisible 赋初值
// _keyBoardlsVisible = NO;
self.insetBottom = 0;
self.mainScroll = [UIScrollView new];
[self.mainScroll setBackgroundColor:[UIColor whiteColor]];
self.mainScroll.delegate = self;
[self.view addSubview:self.mainScroll];
[self.mainScroll makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(self.view);
}];
#pragma mark--包含-个View的布局方式
// self.countView = [[UIView alloc] init];
// self.countView.backgroundColor = [UIColor greenColor];
// [self.mainScroll addSubview:self.countView];
//
// [self.countView makeConstraints:^(MASConstraintMaker *make) {
//这句其实是指定view填充contentSize
// make.edges.equalTo(self.mainScroll);
//确定宽度等于滚动条宽度，也是确定contentSize宽度的关键
// make.width.equalTo(self.mainScroll);
// }];
//由于上面没有指定contentSize高度，此时无法确定滚动高度
//
// UIImageView *imageView1 = [UIImageView new];
// [imageView1 setBackgroundColor:RandColor];
// [self.countView addSubview:imageView1];
// [imageView1 makeConstraints:^(MASConstraintMaker *make) {
// make.top.equalTo(self.countView).offset(20);
// make.left.right.mas_equalTo(self.countView);
// make.height.mas_equalTo(900);
// }];
//
// UIImageView *imageView2 = [UIImageView new];
// [imageView2 setBackgroundColor:RandColor];
// [self.countView addSubview:imageView2];
// [imageView2 makeConstraints:^(MASConstraintMaker *make) {
// make.top.equalTo(imageView1.bottom).offset(20);
// make.left.right.mas_equalTo(self.countView);
// make.height.mas_equalTo(900);
// }];
//
// //当视图高度大于屏幕的时候scrollView就可以滚动，设置宽度的方法相同
// [self.countView updateConstraints:^(MASConstraintMaker *make) {
// // 设置容器视图的底部与要显示的子控件的底部相同，不然scrollView不能滚动
// make.bottom.equalTo(imageView2);
// }];
#pragma mark--包含多个View的布局方式
for (int i=0; i<40; i++) {
UITextField *textF = [UITextField new];
textF.delegate = self;//设置代理
textF.backgroundColor = RandColor;
[self.mainScroll addSubview:textF];
[textF makeConstraints:^(MASConstraintMaker *make) {
//确定宽度等于滚动条宽度，也是确定contentSize宽度的关键
make.width.equalTo(self.mainScroll);
//左边对齐
make.left.equalTo(self.mainScroll);
//y轴计算
make.top.equalTo(self.mainScroll).offset(i*45);
//高度写死
make.height.equalTo(40);
}];
if(i==39){
//到最后一个View时候更新scollerView的contentSize高度也就是底部最多延伸到哪里
[self.mainScroll updateConstraints:^(MASConstraintMaker *make) {
make.bottom.equalTo(textF.bottom);
}];
}
}
// 注册键盘通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrameNotification:) name:UIKeyboardWillChangeFrameNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHideNotification:) name:UIKeyboardWillHideNotification object:nil];
}
#pragma mark--代理方法键盘弹出
-(void)textFieldDidBeginEditing:(UITextField *)textField
{ //得到当前操作的view
self.textField = textField;
}
#pragma mark--代理方法键盘关闭
-(void)textFieldDidEndEditing:(UITextField *)textField
{ //得到当前操作的view
self.textField = textField;
}
#pragma mark--键盘弹出
- (void)keyboardWillChangeFrameNotification:(NSNotification *)notification {
// 获取键盘基本信息（动画时长与键盘高度）
NSDictionary *userInfo = [notification userInfo];
CGRect rect = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGFloat keyboardHeight = CGRectGetHeight(rect);
CGFloat keyboardDuration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
//获得当前输入框的Y坐标
CGFloat inputY = self.textField.frame.origin.y+self.textField.frame.size.height;
//滑动距离
CGFloat offsetY = self.mainScroll.contentOffset.y;
//输入框距离屏幕底部
CGFloat inputJd = self.mainScroll.frame.size.height-(inputY-offsetY);
NSLog(@"键盘高度==%f,输入框距离底部距离==%f",keyboardHeight,inputJd);
if(inputJd<keyboardHeight){
self.insetBottom = keyboardHeight-inputJd;
// 更新滚动条
[UIView animateWithDuration:keyboardDuration animations:^{
[self.mainScroll setContentOffset:CGPointMake(0, offsetY+self.insetBottom) animated:YES];
}];
}
}
#pragma mark--键盘隐藏
- (void)keyboardWillHideNotification:(NSNotification *)notification {
// 获得键盘动画时长
NSDictionary *userInfo = [notification userInfo];
CGFloat keyboardDuration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
//滑动距离
CGFloat offsetY = self.mainScroll.contentOffset.y;
// 更新滚动条
[UIView animateWithDuration:keyboardDuration animations:^{
[self.mainScroll setContentOffset:CGPointMake(0, offsetY-self.insetBottom) animated:YES];
}];
self.insetBottom = 0;
}
#pragma mark--触摸事件
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesBegan:touches withEvent:event];
[self.view endEditing:YES];
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
[self.view endEditing:YES];
}
#pragma mark--移除通知
- (void)dealloc {
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
@end
