iOS--开发小技巧(持续更新)
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// 模糊效果 UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark]; UIVisualEffectView *test = [[UIVisualEffectView alloc] initWithEffect:effect]; test.frame = self.view.bounds; test.alpha = 0; [self.view addSubview:test]; _mytext = test; UISlider *slidel = [[UISlider alloc]initWithFrame:CGRectMake(30, 300, 200, 20)]; slidel.backgroundColor = [UIColor purpleColor]; slidel.value = 0; slidel.maximumValue = 1.0; slidel.minimumValue = 0.0; [self.view addSubview:slidel]; slidel.enabled = YES; [slidel addTarget:self action:@selector(act:) forControlEvents:UIControlEventValueChanged]; - (void)act:(UISlider *)slider { _mytext.alpha = slider.value; }
// 隐藏手机的状态栏 -(BOOL)prefersStatusBarHidden { return YES; }
self.automaticallyAdjustsScrollViewInsets = YES; // 不让系统帮咱们把scrollView及其子类的视图向下调整64
//状态栏显示网络请求提示器 [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; //将window显示在最外面. [[[[UIApplication sharedApplication] delegate] window] addSubview:self.view];
//cell高度 -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { NSString *string = self.lrcArr[indexPath.row]; CGRect frame = [string boundingRectWithSize:CGSizeMake([UIScreen mainScreen].bounds.size.width, 10000) options:(NSStringDrawingUsesLineFragmentOrigin) attributes:[NSDictionary dictionaryWithObject:[UIFont systemFontOfSize:17] forKey:NSFontAttributeName] context:nil]; return frame.size.height; }
// 在ARC工程中导入MRC的类 我们选中工程->选中targets中的工程,然后选中Build Phases->在导入的类后边加入标记 - fno-objc-arc // 在MRC工程中导入ARC的类 路径与上面一致,在该类后面加上标记 -fobjc-arc
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