runtime 计算页面加载时间

#import 

#import 

@interface UIViewController (Swizzle)

@property(nonatomic,assign) CFAbsoluteTime viewLoadStartTime;

@end

#import "UIViewController+Swizzle.h"

#import 

static char *viewLoadStartTimeKey = "viewLoadStartTimeKey";

@implementation UIViewController (Swizzle)

-(void)setViewLoadStartTime:(CFAbsoluteTime)viewLoadStartTime{

objc_setAssociatedObject(self, &viewLoadStartTimeKey, @(viewLoadStartTime), OBJC_ASSOCIATION_COPY);

}

-(CFAbsoluteTime)viewLoadStartTime{

return [objc_getAssociatedObject(self, &viewLoadStartTimeKey) doubleValue];

}

+ (void)load

{

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

SEL origSel = @selector(viewDidAppear:);

SEL swizSel = @selector(swiz_viewDidAppear:);

[UIViewController swizzleMethods:[self class] originalSelector:origSel swizzledSelector:swizSel];

SEL vcWillAppearSel=@selector(viewWillAppear:);

SEL swizWillAppearSel=@selector(swiz_viewWillAppear:);

[UIViewController swizzleMethods:[self class] originalSelector:vcWillAppearSel swizzledSelector:swizWillAppearSel];

SEL vcDidLoadSel=@selector(viewDidLoad);

SEL swizDidLoadSel=@selector(swiz_viewDidLoad);

[UIViewController swizzleMethods:[self class] originalSelector:vcDidLoadSel swizzledSelector:swizDidLoadSel];

SEL vcDidDisappearSel=@selector(viewDidDisappear:);

SEL swizDidDisappearSel=@selector(swiz_viewDidDisappear:);

[UIViewController swizzleMethods:[self class] originalSelector:vcDidDisappearSel swizzledSelector:swizDidDisappearSel];

SEL vcWillDisappearSel=@selector(viewWillDisappear:);

SEL swizWillDisappearSel=@selector(swiz_viewWillDisappear:);

[UIViewController swizzleMethods:[self class] originalSelector:vcWillDisappearSel swizzledSelector:swizWillDisappearSel];

});

}

+ (void)swizzleMethods:(Class)class originalSelector:(SEL)origSel swizzledSelector:(SEL)swizSel

{

Method origMethod = class_getInstanceMethod(class, origSel);

Method swizMethod = class_getInstanceMethod(class, swizSel);

//class_addMethod will fail if original method already exists

BOOL didAddMethod = class_addMethod(class, origSel, method_getImplementation(swizMethod), method_getTypeEncoding(swizMethod));

if (didAddMethod) {

class_replaceMethod(class, swizSel, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));

} else {

//origMethod and swizMethod already exist

method_exchangeImplementations(origMethod, swizMethod);

}

}

- (void)swiz_viewDidAppear:(BOOL)animated

{

[self swiz_viewDidAppear:animated];

if (self.viewLoadStartTime) {

CFAbsoluteTime linkTime = (CACurrentMediaTime() - self.viewLoadStartTime);

NGLog(@" %f s--------------------ssssss   %@:速度：         %f s",self.viewLoadStartTime, self.class,linkTime  );

self.viewLoadStartTime = 0;

}

}

-(void)swiz_viewWillAppear:(BOOL)animated

{

[self swiz_viewWillAppear:animated];

}

-(void)swiz_viewDidDisappear:(BOOL)animated

{

[self swiz_viewDidDisappear:animated];

}

-(void)swiz_viewWillDisappear:(BOOL)animated

{

[self swiz_viewWillDisappear:animated];

}

-(void)swiz_viewDidLoad

{

self.viewLoadStartTime =CACurrentMediaTime();

NSLog(@" %@swiz_viewDidLoad startTime:%f",self.class, self.viewLoadStartTime );

[self swiz_viewDidLoad];

}

@end