我把我觉得很好用的方法技能无私奉献一下吧。欢迎收藏关注。
1.删除某个view上面的所有视图
[self.jggView.subviewsmakeObjectsPerformSelector:@selector(removeFromSuperview)];
2.计算label行间距和字间距
#define UILABEL_LINE_SPACE6
#define HEIGHT [ [ UIScreen mainScreen ] bounds ].size.height
//给UILabel设置行间距和字间距
-(void)setLabelSpace:(UILabel*)label withValue:(NSString*)str withFont:(UIFont*)font {
NSMutableParagraphStyle*paraStyle = [[NSMutableParagraphStylealloc]init];
paraStyle.lineBreakMode=NSLineBreakByCharWrapping;
paraStyle.alignment=NSTextAlignmentLeft;
paraStyle.lineSpacing=UILABEL_LINE_SPACE; //设置行间距
paraStyle.hyphenationFactor=1.0;
paraStyle.firstLineHeadIndent=0.0;
paraStyle.paragraphSpacingBefore=0.0;
paraStyle.headIndent=0;
paraStyle.tailIndent=0;
//设置字间距NSKernAttributeName:@1.5f
NSDictionary*dic =@{NSFontAttributeName:font,NSParagraphStyleAttributeName:paraStyle,NSKernAttributeName:@1.5f
};
NSAttributedString*attributeStr = [[NSAttributedStringalloc]initWithString:strattributes:dic];
label.attributedText= attributeStr;
}
//计算UILabel的高度(带有行间距的情况)
-(CGFloat)getSpaceLabelHeight:(NSString*)str withFont:(UIFont*)font withWidth:(CGFloat)width {
NSMutableParagraphStyle*paraStyle = [[NSMutableParagraphStylealloc]init];
paraStyle.lineBreakMode=NSLineBreakByCharWrapping;
paraStyle.alignment=NSTextAlignmentLeft;
paraStyle.lineSpacing=UILABEL_LINE_SPACE;
paraStyle.hyphenationFactor=1.0;
paraStyle.firstLineHeadIndent=0.0;
paraStyle.paragraphSpacingBefore=0.0;
paraStyle.headIndent=0;
paraStyle.tailIndent=0;
NSDictionary*dic =@{NSFontAttributeName:font,NSParagraphStyleAttributeName:paraStyle,NSKernAttributeName:@1.5f
};
CGSizesize = [strboundingRectWithSize:CGSizeMake(width,HEIGHT)options:NSStringDrawingUsesLineFragmentOriginattributes:diccontext:nil].size;
returnsize.height;
}
3.更新约束问题的动态计算cell的高度
- (CGFloat)tableView:(UITableView*)tableView heightForRowAtIndexPath:(NSIndexPath*)indexPath
{
TCell*cell= [TCellshareInstance];
[cellsetNeedsUpdateConstraints];
[cellupdateConstraintsIfNeeded];
[cellsetCellContent:self.data[indexPath.row]];
[cellsetNeedsLayout];
[celllayoutIfNeeded];
CGFloatheight = [cell.contentViewsystemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
returnheight;
}
4.定义此两个宏可以有效的使用masonry
#define MAS_SHORTHAND
#define MAS_SHORTHAND_GLOBALS
5.第三方类库（有机会下载几个研究一下也是不错的）
http://www.th7.cn/Program/IOS/201601/757661.shtml
6.动画详细介绍
7.textView添加监听字数
if ((textView.text.length - range.length + text.length) > MAX_INPUT_LENGTH)
{
NSString *substring = [text substringToIndex:MAX_INPUT_LENGTH - (textView.text.length - range.length)];
NSMutableString *lastString = [textView.text mutableCopy];
[lastString replaceCharactersInRange:range withString:substring];
textView.text = [lastString copy];
return NO;
}
else
{
return YES;
}
8.React-Native框架学习资料
React-Native学习指南
本指南汇集React-Native各类学习资源，给大家提供便利。指南正在不断的更新，大家有好的资源欢迎Pull Requests！
同时还有Awesome React-Native系列
https://github.com/jondot/awesome-react-native
教程
react-native 官方api文档http://facebook.github.io/react-native/docs/getting-started.html
react-native 中文api文档 (翻译中)https://github.com/ecomfe/react-native-cn
react.js中文文档http://reactjs.cn/
react.js入门教程(gitbook)http://hulufei.gitbooks.io/react-tutorial/content/introduction.html
react.js快速入门教程 - 阮一峰http://www.ruanyifeng.com/blog/2015/03/react.html
react.js视频教程http://react.nodejs-china.org/t/reactjszhong-wen-shi-pin-jiao-cheng-bai-du-wang-pan/584
react-native第一课http://html-js.com/article/2783
深入浅出 React Native：使用 JavaScript 构建原生应用http://zhuanlan.zhihu.com/FrontendMagazine/19996445
React Native通信机制详解http://blog.cnbang.net/tech/2698/
React Native布局篇http://segmentfault.com/a/1190000002658374
React Native 基础练习指北（一）http://segmentfault.com/a/1190000002645929
React Native 基础练习指北（二）http://segmentfault.com/a/1190000002647733
构建一个简单的列表页和2页导航http://www.xn--cnq920ntha.cn/archives/235#6838470-tsina-1-17436-6a377b1a66595f9ede646cf5c012734c
Diary of Building an iOS App with React Nativehttp://herman.asia/building-a-flashcard-app-with-react-native
Use React Native in Existing iOS Apphttp://blog-en.leapoahead.com/post/use-react-native-in-existing-ios-app
tcomb-form-native使用视频教程(需翻墙)http://react.rocks/example/tcomb-form-native
开源APP
研究源码也是一个很好的学习方式
官方演示Apphttps://github.com/facebook/react-native/tree/master/Examples
ReactNativeRubyChinahttps://github.com/henter/ReactNativeRubyChina
HackerNews-React-Nativehttps://github.com/iSimar/HackerNews-React-Native
React-Native新闻客户端https://github.com/tabalt/ReactNativeNews
newswatch(新闻客户端)https://github.com/bradoyler/newswatch-react-native
buyscreen(购买页面)https://github.com/appintheair/react-native-buyscreen
V2EX客户端https://github.com/samuel1112/v2er
react-native-todohttps://github.com/joemaddalone/react-native-todo
react-native-beerhttps://github.com/muratsu/react-native-beer
react-native-starshttps://github.com/86/react-native-stars
模仿天猫首页的apphttps://github.com/baofen14787/react-native-demo
ReactNativeChesshttps://github.com/csarsam/ReactNativeChess
react native 编写的音乐软件https://github.com/Johnqing/miumiu
react-native-pokedexhttps://github.com/ababol/react-native-pokedex
CNode-React-Nativehttps://github.com/SFantasy/CNode-React-Native
8tracks电台客户端https://github.com/voronianski/EightTracksReactNative
React-Native实现的计算器https://github.com/yoxisem544/Calculator-using-React-Native
房产搜索apphttps://github.com/jawee/react-native-PropertyFinder
知乎专栏apphttps://github.com/LeezQ/react-native-zhihu-app
ForeignExchangeApphttps://github.com/peralmq/ForeignExchangeApp
工具
react-native-snippets(代码提示)https://github.com/Shrugs/react-native-snippets
react-native-babel(使用ES6+)https://github.com/roman01la/react-native-babel
资源网站
React-native官网http://facebook.github.io/react-native/
React-China社区http://react-china.org/
React-native组件库（比较全的组件库）http://react.parts/
React Native Moduleshttp://reactnativemodules.com/
11款React Native开源移动 UI 组件http://www.oschina.net/news/61214/11-react-native-ui-components
业界讨论
谈谈 React Native - 唐巧http://blog.devtang.com/blog/2015/02/01/talk-about-react-native/
如何评价React-Native?http://www.zhihu.com/question/27852694/answer/43990708
React Native概述：背景、规划和风险http://div.io/topic/938
指南：https://github.com/ele828/react-native-guide
9.cocopods文件添加到整个工程以及一些可用的注意事项
1.使用CocoaPods导入头文件不能提示？
在BuildSettings中搜索Header Search Path，然后设置$(PODS_ROOT),并勾选recursive支持递归搜索。
2.代码片段路径：~/Library/Developer/Xcode/UserData/CodeSnippets
1.Too many arguments to function call, expected 0, have 2
- Project - Build Settings - ENABLE_STRICT_OBJC_MSGSEND将其设置为NO
2.导入pch文件
(1)Building Setting中搜索pref
(2)将Prefix Header的值设为$(SRCROOT)/$(PRODUCT_NAME)/$(PRODUCT_NAME).pch
3.sizeClass经验总结：
（1）所有公用的控件要出现在**
（2）所有公共的约束需要出现在**
（2）所有的大块view，如果内部子控件的约束是固定的，约束需要写在**中。
总结：在**中要指定大小，同时一般不指定位置，你可以手动拖动位置，便于查看，在其他详细界面再正确调整，这样多个sizeclass查看界面就不会显得很乱。
10.离线缓存
基于NSURLSession+NSURLProtol的UIWebView离线缓存 主要是使用苹果的黑魔法类：NSURLProtocol来对网络请求进行拦截，拦截后使用自定义的网络去加载数据后进行离线缓存。这样保证在没有网络的情况下，也能保证离线能对之前webView进行浏览
11.button 添加双击事件 并且取消单击事件
单击事件：
-(void)singleClick:(UIButton *)button forEvent:(UIEvent *)event{
[self performSelector:@selector(tabButtonTap:) withObject:button afterDelay:0.2];
}
- (void)tabButtonTap:(UIButton *)sender {
NSLog(@"单击操作");
}
双击事件：
-(void)doubleClick:(UIButton *)button forEvent:(UIEvent *)event
{
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(tabButtonTap:) object:button];
NSLog(@"双击操作");
}
这个方法
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(tabButtonTap:) object:button];
解释是Cancels perform requests previously registered with performSelector:withObject:afterDelay:
就是把performSelector:withObject:afterDelay:以前注册的请求取消掉，从代码上看就是取消了tabButtonTap：方法。
但是只能在一个运行循环范围内有效。所以通过这样子就把单击的事件取消了，在后面就可以实现双击的操作，而不必担心会先触发单击。
12.定制tableView的分割线
- (void)tableView:(UITableView*)tableView willDisplayCell:(UITableViewCell*)cell forRowAtIndexPath:(NSIndexPath*)indexPath
{
UIEdgeInsetsinsets =UIEdgeInsetsMake(10,10,10,30);
//三个方法并用，实现自定义分割线效果
if([cellrespondsToSelector:@selector(setSeparatorInset:)]) {
cell.separatorInset= insets;
}
if([cellrespondsToSelector:@selector(setLayoutMargins:)]) {
[cellsetLayoutMargins:insets];
}
if([cellrespondsToSelector:@selector(setPreservesSuperviewLayoutMargins:)]){
[cellsetPreservesSuperviewLayoutMargins:NO];
}
}
实现如下：
UITableView中将分割线样式改为None
tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
自定义UITableViewCell中复写- (void)drawRect:(CGRect)rect方法
- (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetFillColorWithColor(context, [UIColor clearColor].CGColor); CGContextFillRect(context, rect); //上分割线， CGContextSetStrokeColorWithColor(context, [UIColor colorWithHexString:@"ffffff"].CGColor); CGContextStrokeRect(context, CGRectMake(5, -1, rect.size.width - 10, 1)); //下分割线 CGContextSetStrokeColorWithColor(context, [UIColor colorWithHexString:@"e2e2e2"].CGColor); CGContextStrokeRect(context, CGRectMake(5, rect.size.height, rect.size.width - 10, 1)); }
13.保存网络加载的启动图片。
NSDictionary*responseDic = (NSDictionary*)responseObject;
NSDictionary*dic = [responseDicobjectForKey:@"data"];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0), ^{
if(dic) {
NSString*picUrl = [dicobjectForKey:@"pic_url"];
if([picUrlisEqualToString:@""]) {
NSLog(@"pic_url:%@",picUrl);
}else{
NSData*data = [NSDatadataWithContentsOfURL:[NSURLURLWithString:picUrl]];
UIImage*image = [UIImageimageWithData:data];
NSArray*paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString*filePath = [[pathsobjectAtIndex:0]stringByAppendingPathComponent:[NSStringstringWithFormat:@"loading.png"]];//保存文件的名称
// BOOL result = [UIImagePNGRepresentation() writeToFile: filePath atomically:YES]; //保存成功会返回YES
NSLog(@"paths:%@ %@",paths,filePath);
[UIImagePNGRepresentation(image)writeToFile:filePathatomically:YES];
}
}
});
}failure:^(NSError*error) {
NSLog(@"加载启动页广告失败");
}];
14.常量
常量是容易重复被使用和无需通过查找和代替就能快速修改值。常量应该使用static来声明而不是使用#define，除非显式地使用宏。
应该：
[cpp] view plaincopy
1 static NSString * const RWTAboutViewControllerCompanyName = @"RayWenderlich.com";
2 static CGFloat const RWTImageThumbnailHeight = 50.0;
不应该：
[cpp] view plaincopy
1 #define CompanyName @"RayWenderlich.com"
2 #define thumbnailHeight 2
15.UITextField 限制输入数字
限制只能输入特定的字符
(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
NSCharacterSet *cs;
cs = [[NSCharacterSet characterSetWithCharactersInString:NUMBERS]invertedSet];
NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs]componentsJoinedByString:@""]; //按cs分离出数组,数组按@""分离出字符串
BOOL canChange = [string isEqualToString:filtered];
return canChange;
}
上面那个NUMBERS是一个宏，可以在文件顶部定义：
#define NUMBERS @”0123456789\\n” （这个代表可以输入数字和换行，请注意这个\\n，如果不写这个，Done按键将不会触发，如果用在SearchBar中，将会不触发Search事件，因为你自己限制不让输入\\n，好惨，我在项目中才发现的。）
所以，如果你要限制输入英文和数字的话，就可以把这个定义为：
#define kAlphaNum @”ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789″。
当然，你还可以在以上方法return之前，做一提示的，比如提示用户只能输入数字之类的。如果你觉得有需要的话。
限制只能输入一定长度的字符
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string;
{ //string就是此时输入的那个字符 textField就是此时正在输入的那个输入框 返回YES就是可以改变输入框的值 NO相反
if ([string isEqualToString:@"\\n"]) //按会车可以改变
{
return YES;
}
NSString * toBeString = [textField.text stringByReplacingCharactersInRange:range withString:string]; //得到输入框的内容
if (self.myTextField == textField) //判断是否时我们想要限定的那个输入框
{
if ([toBeString length] > 20) { //如果输入框内容大于20则弹出警告
textField.text = [toBeString substringToIndex:20];
UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:nil message:@"超过最大字数不能输入了" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil] autorelease];
[alert show];
return NO;
}
}
return YES;
}
16.当用masonry做约束 需要获取约束之后的具体的frame值你需要这么做。
调用layoutIfNeeded。
期待接下来的更新吧 小伙子。
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