git地址：https://github.com/Assuner-Lee/GRRouter.git
pod 'GRRouter'
前言
界面间的跳转，如果某个对象不能拿到导航控制器，需通过代理，block等方式 委托某个控制器去push或present，比较麻烦。因此，我们写了一个简单的Router去简化这些操作。
用法
push
[GRRouter open:@"push->GRMenuViewController" params:@{@"shop": _cellDataArray[indexPath.row]}];
[GRRouter open:@"push->GRMenuViewController?NO" params:@{@"shop":_shop]}];
如上，假设_shop变量的所属对象为一个cell，router初始化了一个类为GRMenuViewController的控制器 vc，并将cell的_shop变量 赋予了vc的shop属性上，最后router的hostViewController push了vc (?NO为没有动画)。
[GRRouter open:@"push->GRTestViewControllerBeta" params:@{@"color": [UIColor blueColor], @"text": @"push1"}];
present
[GRRouter open:@"present->GRLoginViewController" params:nil completed:^{[MBProgressHUD gr_showFailure:@"请先登录"];}];
[GRRouter open:@"present->GRTestViewControllerBeta" params:@{@"color": [UIColor blueColor], @"text": @"present1"}];
[GRRouter open:@"present->GRTestViewControllerBeta?NO" params:@{@"color": [UIColor redColor], @"text": @"present2"}];
在此之前，我们需要设置GRRouter的hostViewController
简而言之，当需要push，present其他控制器的时候，我们需要总能找到合适的发起者。
在某些情况下，您可以直接指定GRRouter的主控制器，比如主window的rootViewController为UINavigationController类型：
[GRRouter sharedRouter].hostViewController = [UIApplication sharedApplication].delegate.window.rootViewController;
如果控制器层次比较复杂，比如主window的rootViewController为UITabBarController类型，这个UITabBarController对象的控制器数组里又放着若干个UINavigationController
图片1
若想push下一个控制器，且不造成各个导航控制器栈的混乱，我们需要拿到UITabBarController当前选中的控制器。
这时，我们可以动态设置Router的主控制器，如：
[GRRouter getDynamicHostViewController:^UIViewController *{
return ((UITabBarController *)self.window.rootViewController).selectedViewController;
}];
发生了:
+ (void)getDynamicHostViewController:(GRHostBlock)block {
[self sharedRouter].hostBlock = block;
}
简而言之，在push present发生前，router执行block，将block返回的控制器赋给hostViewController。在此block里，你可以描述router在某些时机如何得到合适的跳转发起者，如下。
- (UIViewController *)hostViewController {
if (self.hostBlock) {
_hostViewController = self.hostBlock();
}
return _hostViewController;
}
代码实现
GRRouter.h
#import <UIKit/UIKit.h>
typedef void (^GRBlankBlock)(void);
typedef UIViewController * (^GRHostBlock)(void);
@interface GRRouter : NSObject
@property (nonatomic, strong) UIViewController *hostViewController;
+ (GRRouter *)sharedRouter;
+ (void)getDynamicHostViewController:(GRHostBlock)block;
+ (void)pushViewController:(UIViewController *)aVC animated:(BOOL)animated;
+ (void)presentViewController:(UIViewController *)aVC animated:(BOOL)animated completion:(GRBlankBlock)completion;
+ (void)open:(NSString *)url params:(NSDictionary *)params completed:(GRBlankBlock)block;
+ (void)open:(NSString *)url params:(NSDictionary *)params;
@end
GRRouter.m
#import "GRRouter.h"
#import <objc/runtime.h>
@interface GRRouter ()
@property (nonatomic, copy) GRHostBlock hostBlock;
@end
@implementation GRRouter
+ (GRRouter *)sharedRouter {
static GRRouter *router = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
router = [[GRRouter alloc] init];
});
return router;
}
+ (UIViewController *)hostViewController {
return [[self sharedRouter] hostViewController];
}
- (UIViewController *)hostViewController {
if (self.hostBlock) {
_hostViewController = self.hostBlock();
}
return _hostViewController;
}
//** 此方法可动态指定主控制器，若为静态，请直接设置hostViewController
+ (void)getDynamicHostViewController:(GRHostBlock)block {
[self sharedRouter].hostBlock = block;
}
+ (void)pushViewController:(UIViewController *)aVC animated:(BOOL)animated {
UIViewController *hostVC = [self sharedRouter].hostViewController;
if (hostVC) {
if ([hostVC isKindOfClass:[UINavigationController class]]) {
[(UINavigationController *)hostVC pushViewController:aVC animated:animated];
} else {
[NSException raise:@"GRRouterHostVCError" format:@"hostViewController of Router is not a UINavigationController"];
}
} else {
[NSException raise:@"GRRouterHostVCError" format:@"hostViewController of Router is nil"];
}
}
+ (void)presentViewController:(UIViewController *)aVC animated:(BOOL)animated completion:(GRBlankBlock)completion {
UIViewController *hostVC = [self sharedRouter].hostViewController;
if (hostVC) {
if ([hostVC isKindOfClass:[UIViewController class]]) {
[hostVC presentViewController:aVC animated:animated completion:completion];
} else {
[NSException raise:@"GRRouterHostVCError" format:@"hostViewController of Router is not a UIViewController but (%@)", NSStringFromClass([hostVC class])];
}
} else {
[NSException raise:@"GRRouterHostVCError" format:@"hostViewController of Router is nil"];
}
}
//@"push->GRMenuViewController?NO"
//@"push->GRMenuViewController"
//@"present->GRLoginViewController?NO"
+ (void)open:(NSString *)url params:(NSDictionary *)params completed:(GRBlankBlock)block {
if (url.length) {
NSRange preRange = [url rangeOfString:@"->"];
NSRange sufRange = [url rangeOfString:@"?"];
NSString *openType = [url substringWithRange:NSMakeRange(0, preRange.location)];
NSString *className = [url substringWithRange:NSMakeRange(preRange.location + preRange.length, (sufRange.length ? sufRange.location : url.length) - (preRange.location + preRange.length))];
NSString *animatedType = sufRange.length ? [url substringWithRange:NSMakeRange(sufRange.location + sufRange.length , url.length - (sufRange.location + sufRange.length))] : nil;
Class class = NSClassFromString(className);
if (class && [class isSubclassOfClass:[UIViewController class]]) {
UIViewController *vc = [[class alloc] init];
if (vc) {
unsigned int count;
objc_property_t* props = class_copyPropertyList(class, &count);
for (NSString *key in params.allKeys) {
if (params[key]) {
BOOL isMatched = NO;
for (int i = 0; i < count; i++) {
objc_property_t property = props[i];
const char * name = property_getName(property);
NSString *propertyName = [NSString stringWithCString:name encoding:NSUTF8StringEncoding];
if ([propertyName isEqualToString:key]) {
isMatched = YES;
const char * attributesChar = property_getAttributes(property);
NSString *attributesString = [NSString stringWithCString:attributesChar encoding:NSUTF8StringEncoding];
NSArray * attributesArray = [attributesString componentsSeparatedByString:@","];
NSString *classAttribute = [attributesArray objectAtIndex:0];
NSString * propertyClassString = [classAttribute substringWithRange:NSMakeRange(3, classAttribute.length - 1 - 3)] ;
Class propertyClass = NSClassFromString(propertyClassString);
if (propertyClass && [params[key] isKindOfClass:propertyClass]) {
[vc setValue:params[key] forKey:key];
} else {
[NSException raise:@"GRRouterParamsError" format:@"param:value of (%@) isn't kind of class (%@) but (%@)", key, propertyClassString, NSStringFromClass([params[key] class])];
}
break;
}
}
if (!isMatched) {
[NSException raise:@"GRRouterParamsError" format:@"param:key named (%@) doesn't exist in class (%@)", key, className];
return;
}
}
}
free(props);
if ([openType isEqualToString:@"push"]) {
[self pushViewController:vc animated:([animatedType isEqualToString:@"YES"] || [animatedType isEqualToString:@"NO"]) ? animatedType.boolValue : YES];
} else if ([openType isEqualToString:@"present"]) {
[self presentViewController:vc animated:[animatedType isEqualToString:@"NO"] ? NO : YES completion:block];
} else {
[NSException raise:@"GRRouterOpenTypeError" format:@"openType:(%@) doesn't exist", openType];
}
} else {
[NSException raise:@"GRRouterClassError" format:@"class:(%@) can't init", className];
}
} else {
[NSException raise:@"GRRouterClassError" format:@"class:(%@) doesn't exist or isn't subclass of UIViewController", className];
}
}
}
+ (void)open:(NSString *)url params:(NSDictionary *)params {
[self open:url params:params completed:nil];
}
@end
原理
+ (void)open:(NSString *)url params:(NSDictionary *)params {
[self open:url params:params completed:nil];
}
例如: [GRRouter open:@"push->GRMenuViewController?NO" params:@{@"shop":_shop]}];
首先把字符串url @"push->GRMenuViewController?NO"根据 '->' '?' (?可以省略) 解析分隔成 openType:@"push"，className:@"GRMenuViewController"和animatedType:@"NO", 然后利用runtime方法中的NSClassFromString()得到类Class:GRMenuViewController 并实例化一个对象，接着通过runtime拿到类对象GRMenuViewController里的属性列表，当params字典里的某个key的值匹配上了属性列表里的一个属性名字，接着通过runrime获取该属性的描述，解析出属性的类型，如果属性类型与params key对应的值(对象)的类型相同，就通过KVC将这个key的值赋予到GRMenuViewControlle 实例对象的对应属性上。
最后我们拿到了合适的跳转发起者，并把GRMenuViewControlle实例对象push了出去
- (UIViewController *)hostViewController {
if (self.hostBlock) {
_hostViewController = self.hostBlock();
}
return _hostViewController;
}
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