OCruntime交换方法用在处理iOS版本跨度问题的解决
//交换方法用在处理iOS版本跨度问题的解决.
本文根据常用的UIImage 和 NSMutableArray简介.
#import "UIImage+WCY.h"
#import <objc/runtime.h>
@implementation UIImage (WCY)
//使用运行时的方法交互
//+ (void)initialize {
// NSLog(@"initialize");
//}
// 加载的最早
+ (void)load {
Method m1 = class_getClassMethod([UIImageclass], @selector(imageNamed:));
Method m2 = class_getClassMethod([UIImageclass], @selector(imageWithName:));
method_exchangeImplementations(m1, m2);
}
+ (UIImage *)imageWithName:(NSString *)name;{
NSLog(@"imageWithName");
//内部进行版本控制
NSString *strName = name;
if ([[UIDevicecurrentDevice].systemVersionfloatValue] > 8) {
strName = [NSStringstringWithFormat:@"%@_ios7",name];
}else {
strName = name;
}
//这里用自己的否则会循环引用
UIImage *image = [UIImageimageWithName:strName];
if (image == nil) {
image = [UIImageimageWithName:name];
}
return image;
}
@end
#import "NSMutableArray+WCY.h"
#import <objc/runtime.h>
@implementation NSMutableArray (WCY)
+ (void)load {
//替换数组的时候,是替换的类方法,
Method m1 =class_getInstanceMethod(NSClassFromString(@"__NSArrayM"),@selector(addObject_wcy:));
Method m2 =class_getInstanceMethod(NSClassFromString(@"__NSArrayM"),@selector(addObject:));
method_exchangeImplementations(m1, m2);
}
- (void)addObject_wcy:(id)anObject;{
if (anObject == nil) {
// [self addObject:@"this is nil"];
[selfaddObject_wcy:@"this is nil"];
}else {
// [self addObject:anObject];
[selfaddObject_wcy:anObject];
}
}
@end