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iOS开发过程中的各种tips

前言

iOS开发过程中，总有那么一些个小问题让人纠结，它们不会让程序崩溃，但是会让人崩溃。除此之外，还将分享一些细节现在我通过自己的总结以及从其他地方的引用，来总结一下一些常见小问题。

本篇长期更新，多积累，多奉献，同时感谢其中一些文章的作者的整理，感谢！

iOS高级开发实战讲解

这是我在网上搜索到的 iOS高级开发实战讲解，由于原文不是很方便浏览，所以我在这里整理一部分出来，方便查阅，同时谢谢原作者。

这里我不是每一个都收录进来，这里只是放出一部分，有些用的太多，我就没整理了，大家如果想看可以去看原文。

返回输入键盘

<UITextFieldDelegate>  -(BOOL)textFieldShouldReturn:(UITextField *)textField {     [textField resignFirstResponder];     return YES; }

CGRect

CGRectFromString(<#NSString *string#>)//有字符串恢复出矩形 CGRectInset(<#CGRect rect#>, <#CGFloat dx#>, <#CGFloat dy#>)//创建较小或者较大的矩形 CGRectIntersectsRect(<#CGRect rect1#>, <#CGRect rect2#>)//判断两巨星是否交叉，是否重叠 CGRectZero//高度和宽度为零的，位于（0，0）的矩形常量

隐藏状态栏

[UIApplication sharedApplication] setStatusBarHidden:<#(BOOL)#> withAnimation:<#(UIStatusBarAnimation)#>//隐藏状态栏

自动适应父视图大小

self.view.autoresizesSubviews = YES;     self.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

UITableView的一些方法

这里我自己做了个测试，缩进级别设置为行号，row越大，缩进越多 <UITableViewDelegate>  - (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath {     NSInteger row = indexPath.row;     return row; }

把plist文件中的数据赋给数组

NSString *path = [[NSBundle mainBundle] pathForResource:@"States" ofType:@"plist"]; NSArray *array = [NSArray arrayWithContentsOfFile:path];

获取触摸的点

- (CGPoint)locationInView:(UIView *)view; - (CGPoint)previousLocationInView:(UIView *)view;

获取触摸的属性

@property(nonatomic,readonly) NSTimeInterval      timestamp; @property(nonatomic,readonly) UITouchPhase        phase; @property(nonatomic,readonly) NSUInteger          tapCount;

从plist中获取数据赋给字典

NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"book" ofType:@"plist"]; NSDictionary *dictionary = [NSDictionary dictionaryWithContentsOfFile:plistPath];

NSUserDefaults注意事项

设置完了以后如果存储的东西比较重要的话，一定要同步一下 [[NSUserDefaults standardUserDefaults] synchronize];

获取Documents目录

NSString *documentsDirectory = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];

获取tmp目录

NSString *tmpPath = NSTemporaryDirectory();

利用Safari打开一个链接

NSURL *url = [NSURL URLWithString:@"http://baidu.com"]; [[UIApplication sharedApplication] openURL:url];

利用UIWebView显示pdf文件，网页等等

<UIWebViewDelegate>  UIWebView *webView = [[UIWebView alloc]initWithFrame:self.view.bounds]; webView.delegate = self; webView.scalesPageToFit = YES; webView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; [webView setAllowsInlineMediaPlayback:YES]; [self.view addSubview:webView];      NSString *pdfPath = [[NSBundle mainBundle] pathForResource:@"book" ofType:@"pdf"]; NSURL *url = [NSURL fileURLWithPath:pdfPath]; NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:(NSURLRequestUseProtocolCachePolicy) timeoutInterval:5]; [webView loadRequest:request];

UIWebView和html的简单交互

myWebView = [[UIWebView alloc]initWithFrame:self.view.bounds]; [myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]]]; NSError *error; NSString *errorString = [NSString stringWithFormat:@"<html><center><font size=+5 color='red'>AnError Occurred;<br>%@</font></center></html>",error]; [myWebView loadHTMLString:errorString baseURL:nil];  //页面跳转了以后，停止载入 -(void)viewWillDisappear:(BOOL)animated {     if (myWebView.isLoading) {         [myWebView stopLoading];     }     myWebView.delegate = nil;     [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; }

汉字转码

NSString *oriString = @"/u67aa/u738b"; NSString *escapedString = [oriString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

处理键盘通知

先注册通知，然后实现具体当键盘弹出来要做什么，键盘收起来要做什么 - (void)registerForKeyboardNotifications {  keyboardShown = NO;//标记当前键盘是没有显示的  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardWillShowNotification object:nil];  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasHidden:) name:UIKeyboardDidHideNotification object:nil]; } //键盘显示要做什么 - (void)keyboardWasShown:(NSNotification *)notification {  if (keyboardShown) {   return;  }  NSDictionary *info = [notification userInfo];  NSValue *aValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];  CGSize keyboardSize = [aValue CGRectValue].size;  CGRect viewFrame = scrollView.frame;  viewFrame.size.height = keyboardSize.height;  CGRect textFieldRect = activeField.frame;  [scrollView scrollRectToVisible:textFieldRect animated:YES];  keyboardShown = YES; } - (void)keyboardWasHidden:(NSNotification *)notification {  NSDictionary *info = [notification userInfo];  NSValue *aValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey];  CGSize keyboardSize = [aValue CGRectValue].size;  CGRect viewFrame = scrollView.frame;  viewFrame.size.height += keyboardSize.height;  scrollView.frame = viewFrame;  keyboardShown = NO; }

点击键盘的next按钮，在不同的textField之间换行

- (BOOL)textFieldShouldReturn:(UITextField *)textField {  if ([textField returnKeyType] != UIReturnKeyDone) {   NSInteger nextTag = [textField tag] + 1;   UIView *nextTextField = [self.tableView viewWithTag:nextTag];   [nextTextField becomeFirstResponder];  }else {   [textField resignFirstResponder];  }  return YES; }