Swizzle Interchange Method Name

In iOS runtime there is a function for exchanging method names, called Swizzle, and the following example swaps Imagewithname: With Imagenamed: Two methods to invoke the System method imagenamed: The actual call is Imagewithname:, all the picture names are stitched _os7, when the old project needs to change a set of pictures can be avoided one by one.

@implementation UIImage (Extension)/** *  as long as the classification is loaded into memory, it is called 1 times */+ (void) load{    Method othermehtod = Class_ Getclassmethod (Self, @selector (imagewithname:));    Method Originmehtod = Class_getclassmethod (self, @selector (imagenamed:));    Exchange 2 methods of implementation    Method_exchangeimplementations (Othermehtod, originmehtod);} + (UIImage *) Imagewithname: (NSString *) name{    BOOL iOS7 = [[Uidevice currentdevice].systemversion Floatvalue] >= 7.0;    UIImage *image = nil;    if (iOS7) {        nsstring *newname = [name stringbyappendingstring:@ "_os7"];        Image = [UIImage imagewithname:newname];//here is actually called when the system method imagenamed:    }        if (image = = nil) {        image = [UIImage Imagewithname:name];    }    return image; @end

Swizzle Interchange Method Name