RT，遇到一个奇怪的问题，我想要仪表盘在离开主页面的时候停止，回到主页面继续转，我现在做出来的只能一直转，离开页面了他也在转，跟吃了炫迈似的，根本停不下来，不知道是什么原因，麻烦大神们帮忙看看是什么原因
demo我放上网盘了仪表盘demo下载
代码如下
//
// TableViewController.m
// 仪表盘主页
//
// Created by liu on 15/5/29.
// Copyright (c) 2015年 fcar. All rights reserved.
//
#import "TableViewController.h"
#import "GagueCell.h"
static NSString * CELLID = @"cell";
@interface TableViewController ()
@property(nonatomic,assign)BOOL rota;
@end
@implementation TableViewController
- (void)viewDidLoad
{
[super viewDidLoad];
[self.tableView registerClass:[GagueCell class] forCellReuseIdentifier:CELLID];
self.tableView.bounces = NO;
self.rota = YES;
[self.tableView reloadRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:0 inSection:0]] withRowAnimation:UITableViewRowAnimationFade];
NSLog(@"viewDidLoad");
}
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
self.rota =YES;
[self.tableView reloadRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:0 inSection:0]] withRowAnimation:UITableViewRowAnimationFade];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
GagueCell*cell = [tableView dequeueReusableCellWithIdentifier:CELLID forIndexPath:indexPath];
cell.userInteractionEnabled = NO;
cell.isRefresh = self.rota;
NSLog(@"cellForRowAtIndexPath");
return cell;
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return (self.view.bounds.size.height-88-64)/3;
}
-(CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
return 0.1f;
}
-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return 100.f;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"点击了屏幕");
NSLog(@"didSelectRowAtIndexPath");
}
//这里是storyboard创建的一个导航按钮事件
- (IBAction)nextVC:(UIBarButtonItem *)sender
{
self.rota = NO;
[self.tableView reloadRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:0 inSection:0]] withRowAnimation:UITableViewRowAnimationFade];
[self performSegueWithIdentifier:@"next" sender:nil];
NSLog(@"nextVC");
}
@end
//接下来是仪表盘的cell
// GagueCell.m
// CarBaby
//
// Created by liu on 15/5/26.
// Copyright (c) 2015年 fcar. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface GagueCell : UITableViewCell
@property(nonatomic,assign)BOOL isRefresh;
@end
#import "GagueCell.h"
#import <QuartzCore/CADisplayLink.h>
#define WIDTH self.bounds.size.width
#define HEIGH self.bounds.size.height
@interface GagueCell ()
@property (strong, nonatomic)UIImageView *speed;//仪表盘图片
@property (strong, nonatomic)UISlider *speedSlider;//转盘转动的进度条
@property (strong, nonatomic)UIImageView * pin;//指针图片
@property(nonatomic,strong)UIView * view;//放着仪表盘的View
@property(nonatomic,strong)UILabel * speedLabel;
@property(nonatomic,strong)UILabel * consumption;
@property (nonatomic, strong) CADisplayLink *link;
@end
@implementation GagueCell
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
-(void)start
{
if (self.link) return;
CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(update)];
[link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
self.link = link;
NSLog(@"start");
}
- (void)stopRotating
{
[self.link invalidate];
self.link = nil;
NSLog(@"stopRotating");
}
- (void)update
{
if (self.speedSlider.value >= 30 )
{
self.speedSlider.value ++;
}
if(self.speedSlider.value>=330)
{
self.speedSlider.value = 0;
}
NSLog(@"转盘还在转");
CGFloat angle = self.speedSlider.value/180*M_PI;
[UIView animateWithDuration:1 animations:^{
self.pin.transform = CGAffineTransformMakeRotation(angle);
}];
self.consumption.text = [NSString stringWithFormat:@"当前油耗：%.1f L",3.0];
self.speedLabel.text = [NSString stringWithFormat:@"%@ km/h",@(self.speedSlider.value-30)];
}
-(instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
self.highlighted = NO;
self.view = [[UIView alloc] initWithFrame:CGRectZero];
[self addSubview:self.view];
self.speed = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320,10)];
self.pin = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320,10)];
self.pin.image = [UIImage imageNamed:@"pin"];
self.speed.image = [UIImage imageNamed:@"speed"];
self.speedSlider = [[UISlider alloc] initWithFrame:CGRectZero];
[self.speedSlider addTarget:self action:@selector(rotaSliderChange:) forControlEvents:UIControlEventValueChanged];
self.speedSlider.maximumValue = 330;
self.speedSlider.minimumValue = 30;
self.speedSlider.value = 30;
self.speedSlider.hidden = YES;
self.backgroundView = nil;
self.backgroundColor = nil;
self.selectionStyle = UITableViewCellSelectionStyleNone;
self.speedLabel = [[UILabel alloc] initWithFrame:CGRectZero];
self.consumption = [[UILabel alloc] initWithFrame:CGRectZero];
self.speedLabel.textAlignment = NSTextAlignmentCenter;
self.consumption.textAlignment = NSTextAlignmentCenter;
self.speedLabel.textColor = [UIColor whiteColor];
self.consumption.textColor = [UIColor whiteColor];
[self.view addSubview:self.speed];
[self.view addSubview:self.pin];
[self addSubview:self.speedSlider];
[self addSubview:self.speedLabel];
[self addSubview:self.consumption];
self.view.userInteractionEnabled = NO;
self.speed.userInteractionEnabled = NO;
self.pin.userInteractionEnabled = NO;
}
return self;
}
- (void)rotaSliderChange:(UISlider *)sender
{
}
-(void)layoutSubviews
{
[super layoutSubviews];
CGFloat num =WIDTH>HEIGH?HEIGH:WIDTH;
//CGPoint center = self.center;
self.view.frame =CGRectMake((WIDTH-num)/2, 0, num,num);
self.view.backgroundColor = [UIColor clearColor];
self.speed.center = CGPointMake(num/2, num/2);
self.pin.center = CGPointMake(num/2, num/2);
self.speed.bounds = self.view.bounds;
self.pin.bounds = self.view.bounds;
NSLog(@"layoutSubviews");
self.speedSlider.frame = CGRectMake(0,0, 320, 30);
self.speedLabel.frame = CGRectMake((WIDTH-num)/2, num-70, num, 25);
self.consumption.frame = CGRectMake((WIDTH-num)/2, num-25, num, 25);
self.consumption.text = [NSString stringWithFormat:@"当前油耗：%.1f L",0.f];
self.speedLabel.text = [NSString stringWithFormat:@"%@ km/h",@(0)];
self.consumption.text = [NSString stringWithFormat:@"当前油耗：%.1f L",3.0];
self.speedLabel.text = [NSString stringWithFormat:@"%@ km/h",@(self.speedSlider.value-30)];
}
-(void)setIsRefresh:(BOOL)isRefresh
{
_isRefresh = isRefresh;
NSLog(@"setIsRefresh");
if (self.isRefresh)
{
[self start];
}
else
{
[self stopRotating];
}
}
@end
界面跳转就是跳转到一个空白页面
Reloading a row causes the table view to ask its data source for a new cell for that row.
加这2行 你会发现cell已经不是同一个了 你已经失去了对原来cell的控制 原来的displayer也无法控制了, 你NSLog() 会发现displayer 是null
所以正确做法是:
你在进入下个页面的时候设置有问题。你只是这只了self.rota.对cell.isRefresh完全没有用。
还有你又刷新了cell......
看图吧