iOS Runtime runtime

1, run-time introduction

1. What is the runtime

the run-time mechanism uses the C + + developed, is a set of Apple open-source framework

OC is based on the language of the runtime development, OC in All classes are loaded when they are run.

2. OC language

oc is a full-dynamic language, OC Everything is based on Runtime

3. Using scenes

1.< /span> Runtime Get properties of class dynamically

Span class= "S3" >// main application: Dictionary to model frame Mjextension jsonmodel

2. use Association object add attributes for classification

3. take advantage of Interchange method methods for intercepting systems or other frames

myth: the lower the level of technology used, the more efficient the framework will be

4. Header Files

#import <objc/runtime.h>

2. Run-time application

1. Get information about the properties of a column at run time

1. Get a list of properties for a class

/** if you want to dynamically get the properties of a class, you need to use the Class_copyivarlist member variable Class_copypropertylist property Class_copymethodlist method to the runtime mechanism Class_ Copyprotocollist protocol *////Returns the property list of the Class + (Nsarray *) propertylist {//0. Determine if there is an associated object, and if so, directly return the/** parameter 1> the associated property k associated with the object 2> EY */nsarray *plist = Objc_getassociatedobject (self, Propertieskey), if (plist) {return plist;} 1. Gets the ' class's Properties '/** 1> class 2> property's count pointer */unsigned int count = 0;//return value is an array of all properties obj_property_objc_property_t *list = class_copy PropertyList ([Self class], &count);//Create Storage property array Nsmutablearray *arraym = [Nsmutablearray arraywithcapacity:count]; for (int i = 0; i < count; ++i) {//Get property objc_property_t pty = list[i];//Get property name const char *cname = Property_getname (pty) ; [Arraym addobject:[nsstring stringwithutf8string:cname];} Releases the property array free (list);//sets the associated object/** 1> The associated object 2> the key 3> property of the associated object 4> the holding method of the attribute Reatin, copy, assign */objc_setassoc Iatedobject (self, propertieskey, Arraym, objc_association_copy_nonatomic); return arraym.copy;}

Dictionary-to-model method

Dictionary to model Method + (Instancetype) objectwithdict: (nsdictionary *) Dict{id obj = [[Self alloc] init];//get property list Nsarray *properties = [Self propertylist];//traversal property array for (NSString *key in properties) {//Determine if the dictionary contains this keyif (Dict[key]! = nil) {//Use KVC to set property values [ obj Setvalue:dict[key] forkeypath:key];}} return obj;}

2. Returning a list of methods for a class

///Returns the method list of the class + (Nsarray *) methodlist {//0. Determine if there is a dependency nsarray *mlist = Objc_getassociatedobject (self, Methodskey); if (mlist) {return mlist;} unsigned int count = 0;//1. Get methods List Method *list = Class_copymethodlist ([self class], &count);//Storage method Array Nsmutablearray *arraym = [Nsmutablearray arraywithcapacity:count];for (int i = 0; i < count; ++i) {//Get methods method = list[i];//Get method name sel mname = Method_get Name (method); [Arraym Addobject:nsstringfromselector (Mname)];} Release array free (list);//Set Dependency objc_setassociatedobject (self, methodskey, Arraym, objc_association_copy_nonatomic);
  return arraym.copy;} 

3. Returns the list of implementation protocols for the class

Returns the implementation protocol list for the class + (Nsarray *) protocollist {//0. Determine if there is a dependency nsarray *plist = Objc_getassociatedobject (self, protocolkey); if (pList) {return pList;} unsigned int count = 0;//2. Get the Protocol list protocol * __unsafe_unretained *list = Class_copyprotocollist ([self class], &count);//Create Protocol array Nsmutablearray * Arraym = [Nsmutablearray arraywithcapacity:count];for (int i = 0; i < count; ++i) {//Get agreement protocol * __unsafe_unretaine D prot = list[i];const char *pname = protocol_getname (prot); [Arraym addobject:[nsstring stringwithutf8string:pname];} return Arraym;}

Instance Source Click Open link

iOS Runtime runtime