1 区分tabbar和nav文字修改
self.navigationItem.titleView = nil; ----->导航栏view修改
self.navigationItem.title = THLocalized(@"disconnect");--->单独导航栏文字修改
self.title --->导航栏+tabbar 文字修改
2.imageView 添加动画效果
NSArray *images = [NSArray arrayWithObjects:
[UIImage imageNamed:@"paiZhao"],
[UIImage imageNamed:@"beginLuXiang"], nil];
self.takePhotoImg.animationImages = images;
动画时间 self.takePhotoImg.animationDuration = 0.8;
是否重复 0为循环 self.takePhotoImg.animationRepeatCount = 1;
[self.takePhotoImg startAnimating];
[self.takePhotoImg stopAnimating];
3.线程问题
NSLog(@"1111111111");
dispatch_queue_t queue = dispatch_get_global_queue(0.5, 0);
dispatch_async(queue, ^(void) {
NSLog(@"33333333");
dispatch_async(dispatch_get_main_queue(), ^(void) {
NSLog(@"44444444");
});
});
NSLog(@"22222222");
4. 代码只执行一次
static dispatch_once_t disOnce;
dispatch_once(&disOnce,^ {
FsDoorBellStartSpeakingUa(1,0);
});
5.判断字典是否为nil
if (dict != nil && ([dict isKindOfClass:[NSDictionary class]] == YES))
6.根据 文字数量来改变label字体大小
[_nameLabel setAdjustsFontSizeToFitWidth:YES];
7.命名规范
//判断是否含有非法字符
NSString *str =@"^[A-Za-z0-9\\u4e00-\u9fa5]+$";
NSPredicate* emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", str];
//判断中英文
int a =[nick characterAtIndex:i];
if( a >0x4e00 && a <0x9fff)//中文
8. UISlider监听滑动结束状态
[_bufferSlider addTarget:self action:@selector(sliderValueChanged:) forControlEvents:UIControlEventValueChanged];//变化
[_bufferSlider addTarget:self action:@selector(sliderTouchDown:) forControlEvents:UIControlEventTouchDown];//开始
[_bufferSlider addTarget:self action:@selector(sliderTouchUpInSide:) forControlEvents:UIControlEventTouchUpInside];//结束
- (void)sliderTouchDown:(UISlider *)sender{}
9.更改cell的选中格式
UIImage *image = [UIImage imageNamed:@"door_sel"];
if (cell.accessoryType == UITableViewCellAccessoryNone)
{
image = [UIImage imageNamed:@"door_nosel"];
}
UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
CGRect frame = CGRectMake(0.0,0.0,image.size.width,image.size.height);
button.frame = frame;
[button setBackgroundImage:image forState:UIControlStateNormal];
button.backgroundColor = [UIColor clearColor];
cell.accessoryView = button;
10.[UIImage imageNamed:@""]和[UIImage imageWithContentsOfFile]的使用
[UIImage imageNamed:@""]分配的图像系统会放到cache里面。而关于cache管理的规则就没有明确的介绍。
由此看来[UIImage imageNamed:]只适合与UI界面中小的贴图的读取,而一些比较大的资源文件应该尽量避免使用这个接口。
可以通过直接读取文件路径[UIImage imageWithContentsOfFile]解决掉这个问题.
11.
栈中存在的界面:
跳转至指定页面
NSArray*temArray = self.navigationController.viewControllers;
TestListViewController *test = [[TestListView Controlleralloc] init];
for(UIViewController *temVCintemArray)
{
if([temVC isKindOfClass:[test class]])
{
[self.navigationController popToViewController:temVC animated:YES];
}
}
跨页面跳转至相关页面方法:
指定跳转页面设置对应 tag 值:
self.view.tag = 20000;//tag(需要跳转的当前 VC)
跳转事件 VC 所需实现的方法:
for (int i = 0; i < [self.navigationController viewControllers].count; i++) {
if ([[self.navigationController viewControllers] objectAtIndex:i].view.tag == 20000) {
navTag = i;
} else if ([[self.navigationController viewControllers] objectAtIndex:i].view.tag == 30000) {
navTag = i;
} else if ([[self.navigationController viewControllers] objectAtIndex:i].view.tag == 10000) {
navTag = i;
}
}
[self.navigationController popToViewController:[[self.navigationController viewControllers] objectAtIndex:navTag] animated:YES];
栈中不存在的界面:
NSMutableArray *viewControllers = [self.navigationController.viewControllers mutableCopy];
for (int i = 0; i < viewControllers.count; i++){
id vc = viewControllers[i];
//1.找到要插入界面的前一个界面
if ([vc isKindOfClass:[DBDeviceListController class]]){
WatchMainController *insertVC = [[WatchMainController alloc] init];
//2.插入到界面栈中
[viewControllers insertObject:insertVC atIndex:i + 1];
//3.更新界面栈
[self.navigationController setViewControllers:viewControllers animated:NO];
insertVC.device = device;
//4.跳转到指定界面
[self.navigationController popToViewController:insertVC animated:YES];
return;
}
}
12.单选
1.@property (assign, nonatomic) NSIndexPath *selIndex;//单选,当前选中的行
2.如果cell有复用cellForRowAtIndexPath方法里面加上if (_selIndex == indexPath) 判断
3.didSelectRowAtIndexPath方法里面
//之前选中的,取消选择
DBTimeTableCell *selTimeCell = (DBTimeTableCell*)[tableView cellForRowAtIndexPath:_selIndex];
[selTimeCell.timeSelBtn setImage:[UIImage imageNamed:@"door-noselect"] forState:UIControlStateNormal];
//记录当前选中的位置索引
_selIndex = indexPath;
DBTimeTableCell *timeCell = (DBTimeTableCell*)[_tableView cellForRowAtIndexPath:indexPath];
[timeCell.timeSelBtn setImage:[UIImage imageNamed:@"door-select"] forState:UIControlStateNormal];