1、属性传值
利：正向传值、简单单一
弊：不能反向传值，也不能 跨页面传值
NextViewController* next = [[NextViewControlleralloc]initWithNibName:@"NextViewController"bundle:nil];
//1、属性传值---正向传值
next.str=@"属性传值";
2、单例传值
利：正向/方向传值，跨页面，数据写入内存，从内存读取
弊：需要单例类，并需要创建单例对象
[DefaultInstanceshareInstance].text=@"单例传值”;
DefaultInstance* discrip = [DefaultInstanceshareInstance];
// 2、单例传值 取值
self.textField.text= [DefaultInstanceshareInstance].text;
3、NSUserDefaults传值
利：正向/方向传值，跨页面，数据写入沙盒文件、然后去取
弊：
[[NSUserDefaultsstandardUserDefaults]setObject:@"NSUserDefaults传值"forKey:@"NSUserDefaults”];
self.textField.text= [[NSUserDefaultsstandardUserDefaults]objectForKey:@"NSUserDefaults"];
4、代理传值
利：经典传值，反向传值
弊：1对1 的传值，需要建立代理关系，写法复杂
next.delegate=self;
//代理传值--实现协议方法--接受来自页面2的值
- (void)passValue:(NSString*)str{
self.label.text= str;
}
@protocolPassValueDelegate
- (void) passValue:(NSString* )str;
@end
@property(nonatomic,weak)id delegate;//委托方持有协议，weak防止循环引用
if([_delegateconformsToProtocol:@protocol(PassValueDelegate)] && [_delegaterespondsToSelector:@selector(passValue:)]){
[self.delegatepassValue:_textField.text];
}
5、Block传值
利：苹果主推的传值方式，写法简单，可以实现所有代理的功能。
弊：1对1 的传值，反向传值
@property(nonatomic,copy)void(^block)(NSString* str);
self.block(_textField.text);
next.block= ^(NSString*str) {
self.label.text= str;
};
6、通知传值
利：多对多传值、跨页面，nil为群发
弊：类似有 收音机广播 :收音机必须打开
、、、
[[NSNotificationCenterdefaultCenter]postNotificationName:@"notify"object:niluserInfo:@{@"not":self.textField.text}];
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(nothandle:)name:@"notify"object:nil];
- (void)nothandle:(NSNotification*)not{
self.label.text= not.userInfo[@"not"];
}
、、、
```
_analysisConentStr= analysisConentStr;
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc]initWithString:analysisConentStr];;
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
[paragraphStylesetLineSpacing:10];
[attributedStringaddAttribute:NSParagraphStyleAttributeNamevalue:paragraphStylerange:NSMakeRange(0, analysisConentStr.length)];
self.contentLab.attributedText= attributedString;```
总结：（1、2、3）可以正向传值，（2、3、4、5）可以反向传值
```
/**
* Set the imageView `image` with an `url` and optionally a placeholder image.
*
* The download is asynchronous and cached.
*
*@paramurl The url for the image.
*@paramplaceholder The image to be set initially, until the image request finishes.
*@paramoptions The options to use when downloading the image.@seeSDWebImageOptions for the possible values.
*@paramoperationKey A string to be used as the operation key. If nil, will use the class name
*@paramsetImageBlock Block used for custom set image code
*@paramprogressBlock A block called while image is downloading
* @notethe progress block is executed on a background queue
*@paramcompletedBlock A block called when operation has been completed. This block has no return value
* and takes the requested UIImage as first parameter. In case of error the image parameter
* is nil and the second parameter may contain an NSError. The third parameter is a Boolean
* indicating if the image was retrieved from the local cache or from the network.
* The fourth parameter is the original image url.
*@paramcontext A context with extra information to perform specify changes or processes.
*/
- (void)sd_internalSetImageWithURL:(nullableNSURL*)url
placeholderImage:(nullableUIImage*)placeholder
options:(SDWebImageOptions)options
operationKey:(nullableNSString*)operationKey
setImageBlock:(nullableSDSetImageBlock)setImageBlock
progress:(nullableSDWebImageDownloaderProgressBlock)progressBlock
completed:(nullableSDExternalCompletionBlock)completedBlock
context:(nullableNSDictionaryid> *)context;
```