//
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// BAFPSLabel.m
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// Pods
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//
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// Created by HyanCat on 16/4/4.
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//
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//
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#import "BAFPSLabel.h"
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//#import <Masonry/Masonry.h>
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#define IOS8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
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@interface BAFPSLabel ()
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{
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NSUInteger _tickCount;
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}
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@property (nonatomic, strong) CADisplayLink *displayLink;
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@property (nonatomic, assign) CFTimeInterval lastTime;
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@property (nonatomic, assign) NSUInteger fps;
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@end
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@implementation BAFPSLabel
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+ (instancetype)showInWindow:(UIWindow *)window
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{
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BAFPSLabel *label = [[BAFPSLabel alloc] initWithFrame:CGRectZero];
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label.layer.cornerRadius = 4.f;
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label.layer.masksToBounds = YES;
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label.textAlignment = NSTextAlignmentCenter;
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label.userInteractionEnabled = NO;
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label.font = [UIFont fontWithName:@"Menlo" size:12];
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[window addSubview:label];
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label.translatesAutoresizingMaskIntoConstraints = NO;
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NSLayoutConstraint *leadingLayout =[NSLayoutConstraint constraintWithItem:label
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attribute:NSLayoutAttributeLeading
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relatedBy:NSLayoutRelationEqual
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toItem:window
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attribute:NSLayoutAttributeLeading
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multiplier:1
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constant:10.f];
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NSLayoutConstraint *bottomLayout = [NSLayoutConstraint constraintWithItem:label
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attribute:NSLayoutAttributeBottom
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relatedBy:NSLayoutRelationEqual
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toItem:window
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attribute:NSLayoutAttributeBottom
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multiplier:1
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constant:-10.f];
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NSLayoutConstraint *widthLayout = [NSLayoutConstraint constraintWithItem:label
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attribute:NSLayoutAttributeWidth
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relatedBy:NSLayoutRelationEqual
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toItem:nil
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attribute:NSLayoutAttributeNotAnAttribute
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multiplier:0
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constant:60.f];
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NSLayoutConstraint *heightLayout = [NSLayoutConstraint constraintWithItem:label
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attribute:NSLayoutAttributeHeight
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relatedBy:NSLayoutRelationEqual
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toItem:nil
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attribute:NSLayoutAttributeNotAnAttribute
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multiplier:0
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constant:20.f];
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if (IOS8_OR_LATER) {
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[NSLayoutConstraint activateConstraints:@[leadingLayout, bottomLayout, widthLayout, heightLayout]];
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}
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else {
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[window addConstraints:@[leadingLayout, bottomLayout, widthLayout, heightLayout]];
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}
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return label;
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}
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- (void)dealloc
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{
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[_displayLink invalidate];
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}
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- (instancetype)initWithFrame:(CGRect)frame
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{
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self = [super initWithFrame:frame];
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if (self) {
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_displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(tick:)];
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[_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
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_autoHide = NO;
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[self addObserver:self forKeyPath:NSStringFromSelector(@selector(fps)) options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld context:NULL];
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}
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return self;
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}
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- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context
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{
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if (object == self && [keyPath isEqualToString:NSStringFromSelector(@selector(fps))]) {
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NSUInteger oldFps = [[change valueForKey:NSKeyValueChangeOldKey] unsignedIntegerValue];
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NSUInteger newFps = [[change valueForKey:NSKeyValueChangeNewKey] unsignedIntegerValue];
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if (oldFps != newFps) {
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[self _displayFPS];
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}
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}
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}
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- (void)tick:(CADisplayLink *)displayLink
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{
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CFTimeInterval currentTime = displayLink.timestamp;
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if (_lastTime == 0) {
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// first time.
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_lastTime = currentTime;
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return;
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}
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_tickCount++;
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CFTimeInterval delta = currentTime - _lastTime;
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if (delta < 1) return;
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// get fps
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self.fps = MIN(lrint(_tickCount / delta), 60);
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_tickCount = 0;
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_lastTime = currentTime;
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}
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- (void)fadeOut
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{
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CATransition *fadeTransition = [CATransition animation];
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[self.layer addAnimation:fadeTransition forKey:kCATransition];
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[self setAttributedText:nil];
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self.layer.backgroundColor = nil;
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}
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- (void)_displayFPS
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{
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if (self.attributedText == nil) {
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// fade in
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CATransition *fadeTransition = [CATransition animation];
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[self.layer addAnimation:fadeTransition forKey:kCATransition];
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}
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CGFloat hue = self.fps > 24 ? (self.fps - 24) / 120.f : 0;
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self.textColor = [UIColor colorWithHue:hue saturation:1 brightness:0.9 alpha:1];
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self.text = [NSString stringWithFormat:@"%@ FPS", @(self.fps)];
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self.layer.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.7f].CGColor;
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if (self.autoHide) {
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[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(fadeOut) object:nil];
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[self performSelector:@selector(fadeOut) withObject:nil afterDelay:2];
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}
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}
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@end
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