這里我已經(jīng)將這個動畫封裝成一個類方法，其中顏色，字體大小，背景圖片之類的皆可自定義。此處的動畫是建立在有navigation下方出現(xiàn)，在繼而消失在navigation下方，假如想有什么多的功能，比如點(diǎn)擊彈出View跳出一個控制器等等，效果圖如下所示

效果圖

//.h文件
#import <Foundation/Foundation.h>
@interface YLAnimationShow : NSObject
+ (void)showString:(NSString *)string navigationController:(UINavigationController *)navigationController;
@end
//.m文件
#import "YLAnimationShow.h"
@implementation YLAnimationShow
+ (void)showString:(NSString *)string navigationController:(UINavigationController *)navigationController
{
    UILabel *countLabel = [[UILabel alloc] init];
    countLabel.backgroundColor = [UIColor purpleColor];
    countLabel.width = WindowWidth;
    countLabel.height = 35;    
    countLabel.text = string;  
    countLabel.textAlignment = NSTextAlignmentCenter;
    countLabel.textColor = [UIColor whiteColor];
    countLabel.font = [UIFont systemFontOfSize:16]; 
    // 3.添加
    countLabel.y = 64 - countLabel.height;
    // 將label添加到導(dǎo)航控制器的view中，并且是蓋在導(dǎo)航欄下邊
    [navigationController.view insertSubview:countLabel belowSubview:navigationController.navigationBar];
    CGFloat duration = 1.0; // 動畫的時間
    [UIView animateWithDuration:duration animations:^{
        countLabel.transform = CGAffineTransformMakeTranslation(0, countLabel.height);
    } completion:^(BOOL finished) {
        // 延遲1s后，再利用1s的時間，讓label往上移動一段距離（回到一開始的狀態(tài)）
        CGFloat delay = 1.0; // 延遲1s
        // UIViewAnimationOptionCurveLinear:勻速
        [UIView animateWithDuration:duration delay:delay options:UIViewAnimationOptionCurveLinear animations:^{
            countLabel.transform = CGAffineTransformIdentity;
        } completion:^(BOOL finished) {
            [countLabel removeFromSuperview];
        }];
    }];
}
@end

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沙漠騎士