Iphone 每小时重新加载一次视图
我有一个代码,它为一天中的每一小时生成不同的渐变视图Iphone 每小时重新加载一次视图,iphone,view,gradient,reload,hour,Iphone,View,Gradient,Reload,Hour,我有一个代码,它为一天中的每一小时生成不同的渐变视图 - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. //[self.view setBackgroundColor:[UIColor whiteColor]]; self.navigationController.navigati
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//[self.view setBackgroundColor:[UIColor whiteColor]];
self.navigationController.navigationBar.barStyle = UIBarStyleBlackTranslucent;
NSDate *today = [NSDate date];
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components =
[gregorian components:(NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:today];
NSInteger hour = [components hour];
float dayRed;
float dayGreen;
float dayBlue;
float nightRed;
float nightGreen;
float nightBlue;
BOOL from0to12 = NO;
BOOL from12to24 = NO;
if (hour >= 0 && hour <= 12) {
from0to12 = YES;
}
else if (hour > 12 && hour <= 23) {
from12to24 = YES;
}
if (from0to12)
{
NSLog(@"%d AM", hour);
dayRed = 0.0;
dayGreen = 0.0;
dayBlue = 1 - (0.083333333333 * hour);
NSLog(@"%f, %f, %f", dayRed, dayGreen, dayBlue);
nightRed = 0.083333333333 * hour;
nightGreen = (0.083333333333 * hour)/2;
nightBlue = 0;
NSLog(@"%f, %f, %f", nightRed, nightGreen, nightBlue);
}
else if (from12to24)
{
NSLog(@"%d AM", hour);
hour = 24-hour;
dayRed = 0.083333333333 * hour;
dayGreen = (0.083333333333 * hour)/2;
dayBlue = 0;
NSLog(@"%f, %f, %f", dayRed, dayGreen, dayBlue);
nightRed = 0;
nightGreen = 0;
nightBlue = 1-(0.083333333333 * hour);
NSLog(@"%f, %f, %f", nightRed, nightGreen, nightBlue);
}
UIColor *day = [UIColor colorWithRed:dayRed green:dayGreen blue:dayBlue alpha:1.0];
UIColor *night = [UIColor colorWithRed:nightRed green:nightGreen blue:nightBlue alpha:1.0];
GradientView *gradient = [[GradientView alloc] initWithFrame:CGRectMake(0,0,320,50)];
[gradient setColoursWithCGColors:day.CGColor:night.CGColor];
self.view = gradient;
}
-(void)viewDidLoad
{
[超级视图下载];
//加载视图后,通常从nib执行任何其他设置。
//[self.view setBackgroundColor:[UIColor-whiteColor]];
self.navigationController.navigationBar.barStyle=UIBarStyleBlack半透明;
NSDate*今天=[NSDate日期];
NSCalendar*格里高利=[[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
NSDATE组件*组件=
[公历成分:(NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit)from date:today];
NSInteger小时=[组件小时];
浮出白昼;
漂浮在阳光下;
浮蓝;
飘浮夜红;
漂浮的夜绿色;
漂浮夜蓝色;
BOOL从0到12=否;
BOOL从12到24=否;
如果(小时>=0&&hour 12&&hour为每1小时安排一个计时器
-(void)viewDidLoad
{
[NSTimer scheduledTimerWithTimeInterval:3600 target:self selector:@selector(loadGradient:) userInfo:nil repeats:YES];
}
-(void)loadGradient:(id)sender
{
// Do your code for effect every 1 hour
}
所以一遍又一遍地调用整个方法是安全的?我认为应该先销毁视图,然后再创建:数据此代码不会在应用程序启动时生成视图,我希望它每整小时更改一次,比如下午1点、下午2点、下午3点。。。