SafeObject
支持pod导入
-
pod 'SafeObject'
-
执行pod search SafeObject提示搜索不到，可以执行以下命令更新本地search_index.json文件
rm ~/Library/Caches/CocoaPods/search_index.json- 如果pod search还是搜索不到，执行pod setup命令更新本地spec缓存（可能需要几分钟），然后再搜索就可以了
App常见崩溃，容器越界，字典空值
- 数组下标越界
示例代码：
- (void)testArrayOutOfBounds
{
NSArray *testArray = @[@1,@2,@3];
NSNumber *num = testArray[3];
}- 字典构造造与修改
示例代码：
- (void)testDicSetNilValueCrash
{
// 构造不可变字典时 key和value都不能为空
NSString *nilValue = nil;
NSString *nilKey = nil;
NSDictionary *dic1 = @{@"key" : nilValue};
NSDictionary *dic2 = @{nilKey : @"value"};
}
方法交换
- Runtime解决数据越界及字典key或value为nil的情况，主要通过Runtime的方法交换实现，可以扩展一下NSObject分类:
+ (void)exchangeInstanceMethodWithSelfClass:(Class)selfClass
originalSelector:(SEL)originalSelector
swizzledSelector:(SEL)swizzledSelector {
Method originalMethod = class_getInstanceMethod(selfClass, originalSelector);
Method swizzledMethod = class_getInstanceMethod(selfClass, swizzledSelector);
BOOL didAddMethod = class_addMethod(selfClass,
originalSelector,
method_getImplementation(swizzledMethod),
method_getTypeEncoding(swizzledMethod));
if (didAddMethod) {
class_replaceMethod(selfClass,
swizzledSelector,
method_getImplementation(originalMethod),
method_getTypeEncoding(originalMethod));
} else {
method_exchangeImplementations(originalMethod, swizzledMethod);
}
}
/**
在range范围内， 移除掉anObject
@param anObject 移除的anObject
@param range 范围
*/
- (void)safeMutable_removeObject:(id)anObject inRange:(NSRange)range {
if (range.location > self.count) {
return;
}
if (range.length > self.count) {
return;
}
if ((range.location + range.length) > self.count) {
return;
}
if (!anObject){
return;
}
return [self safeMutable_removeObject:anObject inRange:range];
}