** 好記性不如爛筆頭 記錄一些自己在開發中經常用到的一些瑣碎代碼片段 會經常更新 .. **

1、目前iOS項目中要求導航欄的返回按鈕只保留那個箭頭，去掉后邊的文字，在網上查了一些資料，最簡單且沒有副作用的方法就是

[UIBarButtonItem appearance]setBackButtonTitlePositionAdjustment:UIOffsetMake(0,-60)] for BarMetrics:UIBarMetricsDefault];

2、簡單實現一個導航欄的下的提示視圖 效果如下

未命名.gif

- (void)showNewStatusesCount:(NSInteger)nums{

    UILabel *label = [[UILabel alloc] init];
    label.font = [UIFont systemFontOfSize:12];
    
    if (nums) {
        label.text = [NSString stringWithFormat:@"新%ld條數據", count];
    } else {
        label.text = @"暫無新數據";
    }
    
    label.backgroundColor = [UIColor colorWithRed:0/255.0  green:174/255.0 blue:22/255.0 alpha:1.0];
    label.textAlignment = NSTextAlignmentCenter;
    label.textColor = [UIColor whiteColor];
    
    label.width = self.view.frame.size.width;
    label.height = 35;
    label.x = 0;
    label.y = CGRectGetMaxY([self.navigationController navigationBar].frame) - label.frame.size.height;
    
    [self.navigationController.view insertSubview:label belowSubview:self.navigationController.navigationBar];

    [UIView animateWithDuration:.8f; animations:^{

        label.transform = CGAffineTransformMakeTranslation(0, label.frame.size.height);

    } completion:^(BOOL finished) { /
       
        [UIView animateWithDuration:duration delay:.8f options:UIViewAnimationOptionCurveEaseInOut animations:^{
            
            label.transform = CGAffineTransformIdentity;
            
        } completion:^(BOOL finished) {
           
            [label removeFromSuperview];
        }];
    }];
}

3、平時有用到更改label的行間距 使其排版看起來更美觀

屏幕快照 2017-01-17 下午2.25.27.png