点击return取消textView 的响应者
- - (BOOL)textFieldShouldReturn:(UITextField *)textField
- {
- [_contactTextFiled resignFirstResponder];
- return YES;
- }
- - (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{
- if([text isEqualToString:@"\n"]){
- [textView resignFirstResponder];
- [_contactTextFiled becomeFirstResponder];
- return YES;
- }
- return YES;
- }
- [xxxView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
有效解决刷新单个cell或者section闪一下的问题:
- [UIView setAnimationsEnabled:NO];
- [_listTable beginUpdates];
- [_listTable reloadSections:[NSIndexSet indexSetWithIndex:indexPath.section] withRowAnimation:UITableViewRowAnimationNone];
- [_listTable endUpdates];
- [UIView setAnimationsEnabled:YES];
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画出下列曲线:
- UIView *myCustomView = [[UIView alloc]initWithFrame:CGRectMake(0, 204,kScreenWidth, 120)];
- myCustomView.backgroundColor = [UIColor whiteColor];
- [view addSubview:myCustomView];
- UIBezierPath *bezierPath = [UIBezierPath bezierPath];
- [bezierPath moveToPoint:CGPointMake(0,0)];
- [bezierPath addCurveToPoint:CGPointMake(myCustomView.width, 0) controlPoint1:CGPointMake(0, 0) controlPoint2:CGPointMake(myCustomView.width/2, 40)];
- [bezierPath addLineToPoint:CGPointMake(myCustomView.width, myCustomView.height)];
- [bezierPath addLineToPoint:CGPointMake(0, myCustomView.height)];
- [bezierPath closePath];
- CAShapeLayer *shapLayer = [CAShapeLayer layer];
- shapLayer.path = bezierPath.CGPath;
- myCustomView.layer.mask = shapLayer;
- myCustomView.layer.masksToBounds = YES;
当你使用 UISearchController 在 UITableView 中实现搜索条,在搜索框已经激活并推入新的 VC 的时候会发生搜索框重叠的情况:那就是 definesPresentationContext 这个布尔值!
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TabBar的隐藏与消失:
- - (void)hidesTabBar:(BOOL)hidden{
- [UIView beginAnimations:nil context:NULL];
- [UIView setAnimationDuration:0];
- for (UIView *view in self.tabBarController.view.subviews){
- if ([view isKindOfClass:[UITabBar class]]) {
- if (hidden) {
- [view setFrame:CGRectMake(view.frame.origin.x, [UIScreen mainScreen].bounds.size.height, view.frame.size.width , view.frame.size.height)];
- }else{
- [view setFrame:CGRectMake(view.frame.origin.x, [UIScreen mainScreen].bounds.size.height - 49, view.frame.size.width, view.frame.size.height)];
- }
- }else{
- if([view isKindOfClass:NSClassFromString(@"UITransitionView")]){
- if (hidden){
- [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, [UIScreen mainScreen].bounds.size.height)];
- }else{
- [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, [UIScreen mainScreen].bounds.size.height - 49 )];
- }
- }
- }
- }
- [UIView commitAnimations];
- }
获取cell上按钮所在分区和行数:
- UIView *view = [sender superview]; // 获取父视图的view
- GCCollectGroupCellTableViewCell *cell = (GCCollectGroupCellTableViewCell*)[view superview]; // 获取cell
- NSIndexPath *indexPath = [_listTable indexPathForCell:cell]; // 获取cell对应的分区
- NSLog(@"%@",detailArr[indexPath.section-1][indexPath.row][@"comname"]);
NSAttributedString 与NSString互转:
- NSAttributedString * attrStr = [[NSAttributedString alloc] initWithData:[_CompanyFileds.comname dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];
- _CompanyFileds.comname = attrStr.string;
监控UITextField 变化:
- // 注册监听
- [[NSNotificationCenter defaultCenter]postNotificationName:UITextFieldTextDidChangeNotification object:nil];
- [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(changeForKeyWord:) name:UITextFieldTextDidChangeNotification object:nil];
- // 监听_pageTextField.text变化
- - (void)changeForKeyWord:(NSNotification *)sender
- {
- [self checkNum:_pageTextField.text];
- }
- - (BOOL)checkNum:(NSString *)str
- {
- NSString *regex = @"^[0-9]+(.[0-9]{2})?$";
- NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
- BOOL isMatch = [pred evaluateWithObject:str];
- if (!isMatch && _pageTextField.text.length>0) {
- UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:nil message:@"页码只能输入数字哦" delegate:self cancelButtonTitle:@"重新输入" otherButtonTitles:nil, nil nil];
- alertView.delegate = self;
- [alertView show];
- return NO;
- }
- return YES;
- }
监听UITextField的点击事件
- [[NSNotificationCenter defaultCenter]postNotificationName:UITextFieldTextDidBeginEditingNotification object:nil];
- [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(enterEdited:) name:UITextFieldTextDidBeginEditingNotification object:nil];
- - (void)enterEdited:(NSNotification *)sender
- {
- 事件写这里!希望帮到你!
- }
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解决添加到父视图手势影响子视图手势的解决办法:(手势冲突)
- //方法一:
- #pragma mark--UIGestureRecognizerDelegate
- -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
- {
- if([touch.view isKindOfClass:[UIButton class]]||[touch.view isKindOfClass:[UITableViewCell class]]||[touch.view isKindOfClass:[UITextField class]]||[touch.view isKindOfClass:[UITextView class]])
- {
- return NO;
- }
- return YES;
- }
- //方法二:
- //UIView的exclusiveTouch属性
- //通过设置[self setExclusiveTouch:YES];可以达到同一界面上多个控件接受事件时的排他性,从而避免一些问题。
UITextField 边框样式及内容调整:
- //1. 设置的时候在ib里面记得选择无边框的,要不然随便你设置,都是无效的,也是坑死了。
- _textBoxName.layer.borderWidth=1.0f;
- _textBoxName.layer.borderColor=[UIColorcolorWithRed:0xbf/255.0fgreen:0xbf/255.0fblue:0xbf/255.0falpha:1].CGColor;
- //2.在uitextfield 中文字最左边距离左侧边框的距离
- _textBoxName.leftView=[[UIViewalloc] initWithFrame:CGRectMake(0,0, 16,51)];
- _textBoxName.leftViewMode=UITextFieldViewModeAlways;
图片旋转控制:
- #pragma mark ----- 更新按钮动画
- - (void)rotate360DegreeWithImageViews:(UIImageView *)myViews{
- CABasicAnimation *rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
- rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 ];
- rotationAnimation.duration = 1.0;
- rotationAnimation.cumulative = YES;rotate360DegreeWithImageViews
- rotationAnimation.repeatCount = 100000;
- [myViews.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
- }
- [myViews.layer removeAllAnimations]; // 停止
改变cell的选中颜色:
- cell.selectedBackgroundView = [[UIView alloc] initWithFrame:cell.frame];
- cell.selectedBackgroundView.backgroundColor = COLOR_BACKGROUNDVIEW;
- 不需要任何颜色可以这么设置:
- cell.selectionStyle = UITableViewCellSelectionStyleNone;
取整问题:
- Objective-C拓展了C,自然很多用法是和C一致的。比如浮点数转化成整数,就有以下四种情况。
- 1.简单粗暴,直接转化
- float f = 1.5; int a; a = (int)f; NSLog("a = %d",a);
- 输出结果是1。(int)是强制类型转化,丢弃浮点数的小数部分。
- 2.高斯函数,向下取整
- float f = 1.6; int a; a = floor(f); NSLog("a = %d",a);
- 输出结果是1。floor()方法是向下取整,类似于数学中的高斯函数 [].取得不大于浮点数的最大整数,对于正数来说是舍弃浮点数部分,对于复数来说,舍弃浮点数部分后再减1.
- 3.ceil函数,向上取整。
- float f = 1.5; int a; a = ceil(f); NSLog("a = %d",a);
- 输出结果是2。ceil()方法是向上取整,取得不小于浮点数的最小整数,对于正数来说是舍弃浮点数部分并加1,对于复数来说就是舍弃浮点数部分.
- 4.通过强制类型转换四舍五入。
- float f = 1.5; int a; a = (int)(f+0.5); NSLog("a = %d",a);
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