iOS开发过程中的各种tips
jopen
9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）