//
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// HBdansLable.m
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// 弹幕
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//
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// Created by 伍宏彬 on 15/10/14.
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// Copyright (c) 2015年 伍宏彬. All rights reserved.
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//
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#import "HBdansLable.h"
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@interface HBdansLable()
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{
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HBdansLable *_randomLable;
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}
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@property (nonatomic, strong) CADisplayLink *displayLink;
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@property (nonatomic, assign) BOOL isStar;
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@end
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@implementation HBdansLable
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+ (instancetype)dansLableFrame:(CGRect)frame
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{
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HBdansLable *dansLable = [[HBdansLable alloc] initWithFrame:frame];
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return dansLable;
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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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self.textAlignment = NSTextAlignmentCenter;
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// self.layer.cornerRadius = self.roundVaule;
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// self.layer.masksToBounds = YES;
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//
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// self.layer.borderColor = self.lineColor.CGColor;
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// self.layer.borderWidth = self.lineWidth;
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[self addObserver:self forKeyPath:@"frame" options:NSKeyValueObservingOptionNew context:nil];
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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 *)change context:(void *)context
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{
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HBdansLable *dansLable = (HBdansLable *)object;
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if ([self.delegate respondsToSelector:@selector(dansLable:isOutScreen:)]) {
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[self.delegate dansLable:dansLable isOutScreen:[self isOutScreen]];
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}
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}
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- (void)updateFrame
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{
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if (self.isStar)
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self.x -= 1;
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}
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- (void)starDans
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{
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self.displayLink.paused = NO;
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[self.displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
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self.isStar = YES;
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}
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- (void)stopDans
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{
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if (self.displayLink.isPaused) return;
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self.displayLink.paused = YES;
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self.isStar = NO;
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[self.displayLink invalidate];
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self.displayLink = nil;
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}
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- (BOOL)isOutScreen
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{
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if (self.x < 0 && ABS(self.x) >= self.width) {
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[self stopDans];
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return YES;
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}
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return NO;
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}
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#pragma mark - getter
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- (CADisplayLink *)displayLink
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{
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if (!_displayLink) {
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_displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(updateFrame)];
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_displayLink.frameInterval = 1;
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}
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return _displayLink;
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}
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- (void)setText:(NSString *)text
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{
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[super setText:text];
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CGRect contextFrame = [text boundingRectWithSize:CGSizeMake(MAXFLOAT, self.height)
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options:NSStringDrawingUsesLineFragmentOrigin
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attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:17]}
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context:nil];
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NSString *str = [NSString stringWithFormat:@"%.f",contextFrame.size.width + 10];
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self.width = [str floatValue];
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self.height = contextFrame.size.height + 6;
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[self starDans];
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}
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- (void)dealloc
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{
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[self removeObserver:self forKeyPath:@"frame" context:nil];
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}
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@end
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