IOS 小问题笔记

UINavigationController 设置半透明

navigation.navigationBar.translucent =YES;

获取根视图
[UIApplication sharedApplication].keyWindow.rootViewController

获取根视图代理类

[UIApplication sharedApplication].delegate

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.3f];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];

[myDelegate.leftView setFrame: leftRect];
[rootViewController.view setFrame: rightRect];

[UIView commitAnimations];

折纸效果动画
http://code4app.com/ios/XYOrigami/4fcc23166803fa6337000000
UIScrollView滚动到指定位置

[mScrollView setContentOffset:CGPointMake(0, 200) animated:YES];

IOS添加左右手势

// 添加手势
UISwipeGestureRecognizer * swipeGestureLeft = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(leftBarClick:)];
swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLeft;
self.swipeGestureLeft=swipeGestureLeft;

UISwipeGestureRecognizer * swipeGestureRight = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(leftBarClick:)];
swipeGestureRight.direction = UISwipeGestureRecognizerDirectionRight;
self.swipeGestureRight=swipeGestureRight;
[self.view addGestureRecognizer:swipeGestureLeft];
[self.view addGestureRecognizer:swipeGestureRight];

只支持竖屏

1.在工程里面找到Supporting Files文件夹；

2.找到文件夹下面的XXXX-Info.plist，选中打开；

3.找到Supported interface orientation,会发现里面除了支持竖屏还支持其他方向



4.选中item0，会发现有“+”和“-”，选中“-”将item0删除



5.对item1进行同样的操作，让最后只剩item2.那么工程中所有的页面就只支持竖屏了



动态修改navigationbar显示与否

self.navigationController.navigationBar.hidden = NO;

UIScroView设置滚动没有惯性 bounces

（1）当bounces属性设置为YES时，当UIScrollView中图片滑动到边界的时候会出现弹动的效果，就像是Linux中的果冻效果一样。

（2）当bounces属性设置为NO时，当UIScrollView中图片滑动到边界时会直接定在边界就不会有弹动的效果。

点击UITextField显示键盘,并且在键盘上面显示一个视图

textField.inputAccessoryView = inputView;
[textField becomeFirstResponder];

状态栏loading状态

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

UITableView不显示分割线

tableView.separatorStyle = UITableViewCellSeparatorStyleNone;