UITableView分割线置顶
/**
* 分割线顶头
*/
-(void)viewDidLayoutSubviews
{
if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {
[self.tableView setSeparatorInset:UIEdgeInsetsMake(0,0,0,0)];
}
if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {
[self.tableView setLayoutMargins:UIEdgeInsetsMake(0,0,0,0)];
}
}
-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
[cell setSeparatorInset:UIEdgeInsetsZero];
}
if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
[cell setLayoutMargins:UIEdgeInsetsZero];
}
}
作者：StrongX
链接：http://www.jianshu.com/p/378ca60232ef
來源：简书
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。
1.NSArray 快速求总&&最大值&&最小值&&平均值
- (void)getAveageValue {
NSMutableArray *array = [[NSMutableArray alloc]init];
ModelItem *item1 = [[ModelItem alloc]init];
item1.percent = 30;
item1.name = @"item1";
[array addObject:item1];
ModelItem *item2 = [[ModelItem alloc]init];
item2.percent = 20;
item2.name = @"item2";
[array addObject:item2];
ModelItem *item3 = [[ModelItem alloc]init];
item3.percent = 10;
item3.name = @"item3";
[array addObject:item3];
CGFloat sum = [[array valueForKeyPath:@"@sum.percent.floatValue"] floatValue];
CGFloat avg = [[array valueForKeyPath:@"@avg.percent.floatValue"] floatValue];
CGFloat max = [[array valueForKeyPath:@"@max.percent.floatValue"] floatValue];
CGFloat min = [[array valueForKeyPath:@"@min.percent.floatValue"] floatValue];
NSLog(@"\n总和：%f\n平均：%f\n最大：%f\n最小：%f",sum,avg,max,min);
}
//模型对象
@interface ModelItem : NSObject
@property (nonatomic,assign) CGFloat percent;
@property (nonatomic, copy) NSString *name;
@end
图1.png
获取沙盒根目录
NSString *directory = NSHomeDirectory();
NSLog(@"directory:%@", directory);
2.UITableView，取消区头停滞效果
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat sectionHeaderHeight = sectionHead.height;
if (scrollView.contentOffset.y<=sectionHeaderHeight&&scrollView;.contentOffset.y>=0)
{
scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);
}
else if(scrollView.contentOffset.y>=sectionHeaderHeight)
{
scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);
}
}
3.获取某个view所在的控制器
- (UIViewController *)viewController
{
UIViewController *viewController = nil;
UIResponder *next = self.nextResponder;
while (next)
{
if ([next isKindOfClass:[UIViewController class]])
{
viewController = (UIViewController *)next;
break;
}
next = next.nextResponder;
}
return viewController;
}
4.两种方法删除NSUserDefaults所有记录
//方法一
NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];
//方法二
- (void)resetDefaults
{
NSUserDefaults * defs = [NSUserDefaults standardUserDefaults];
NSDictionary * dict = [defs dictionaryRepresentation];
for (id key in dict)
{
[defs removeObjectForKey:key];
}
[defs synchronize];
}
5.UIImage 占用内存大小
UIImage *image = [UIImage imageNamed:@"aa"];
NSUInteger size = CGImageGetHeight(image.CGImage) * CGImageGetBytesPerRow(image.CGImage);
6.去掉导航栏返回的back标题
[[UIBarButtonItemappearance]setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)forBarMetrics:UIBarMetricsDefault];
7.JSPatch 的frame对象的使用
require('UIColor,UIView');//第一个坑，需要导入对应的控制器名称
defineClass('ViewController', {
initSubView: function() {
//第二个坑，没有CGRectMake(100,100,100,100),用initWithFrame({x:100,y:100,width:100,heigt:100});
var view = UIView.alloc().initWithFrame({x:100, y:100, width:100, height:100});
view.setBackgroundColor(UIColor.blackColor());
self.view().addSubview(view);
},
});
//将图片存到本地
- (void)AViewDidLoad {
[[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:launchImageEntity.result[0].imageUrl] options:SDWebImageRetryFailed progress:nil completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
if (image) {
[weakSelf downloadLaunchImageSuccessWithImage:image
andImageName:imageName];
[CommonMethod setUserdefaultWithValue:[NSNumber numberWithDouble:curUpdateTime]
forKey:updateTime];
}
}];
}
-(void)downloadLaunchImageSuccessWithImage:(UIImage *)image
andImageName:(NSString *)imageName
{
NSString *documentPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
//设置图片路径
NSString *imagePath = [documentPath stringByAppendingString:[NSString stringWithFormat:@"/%@.png",imageName]];
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:imagePath]) {
[fileManager removeItemAtPath:imagePath
error:nil];
}
if (image) {
[UIImagePNGRepresentation(image) writeToFile:imagePath
atomically:YES];
}
}
//取出本地保存的图片
- (void)BViewDidLoad {
//取本地保存的首页广告图
NSString *documentPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
NSString *imagePath = [documentPath stringByAppendingString:[NSString stringWithFormat:@"/%@.png",EntrustTopImageName]];
UIImage *image = [UIImage imageWithContentsOfFile:imagePath];
}
