#import "loveView.h"//点击按钮-(void)buttonclick{UIWindow *window = [UIApplication sharedApplication].keyWindow;loveView *loveview = [[loveView alloc] initWithFrame:window.bounds];loveview.alpha = 0;[window.rootViewController.view addSubview:loveview];[UIView animateWithDuration:0.5                 animations:^{        loveview.alpha = 1.0;    } ];}

　　

#import "loveView.h"@implementation loveView- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        // Initialization code                [self   creatView];            }    return self;}-(void)creatView{    [self setBackgroundColor:[UIColor clearColor]];        UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 568)];    backView.center = self.center;    [backView setBackgroundColor:[UIColor blackColor]];    [self addSubview:backView];    backView.alpha = 0.3;        UIView *mainView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 280, 200)];    mainView.center = self.center;    [mainView setBackgroundColor:[UIColor whiteColor]];    [self addSubview:mainView];            UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 10,260, 50)];    label.text = @"   Love Me？那就告诉全世界吧！";    label.backgroundColor = [UIColor clearColor];    label.textAlignment = NSTextAlignmentCenter;    label.textColor = [UIColor  blueColor];        UIButton *yesBtn = [[UIButton alloc] initWithFrame:CGRectMake(10, 60, 260, 50)];    [yesBtn setBackgroundColor:[UIColor  greenColor]];    [yesBtn setTitle:@"好！" forState:UIControlStateNormal];    [yesBtn setTitleColor:[UIColor  redColor] forState:UIControlStateNormal];    [yesBtn addTarget:self action:@selector(yesBtnClick) forControlEvents:UIControlEventTouchUpInside];        UIButton *noBtn = [[UIButton alloc] initWithFrame:CGRectMake(10, 130, 260, 50)];    [noBtn setBackgroundColor:[UIColor redColor]];    [noBtn setTitle:@"不，谢谢" forState:UIControlStateNormal];    [noBtn addTarget:self action:@selector(noBtnClick) forControlEvents:UIControlEventTouchUpInside];        [mainView addSubview:label];    [mainView addSubview:yesBtn];    [mainView addSubview:noBtn];}- (void)yesBtnClick{        NSLog(@"YES!!!");    [UIView animateWithDuration:0.5 animations:^{                self.alpha = 0.0;    } completion:^(BOOL finished) {        [self removeFromSuperview];    }];}- (void)noBtnClick{    NSLog(@"NO!!!");    [UIView animateWithDuration:0.5 animations:^{                self.alpha = 0.0;            } completion:^(BOOL finished) {        [self removeFromSuperview];    }];    }@end