iOS开发过程中的各种tips

jopen 4年前

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;  }

总结

不积跬步无以至千里,不积小流无以成江海。(随时更新)

原文 http://segmentfault.com/a/1190000003505115