照片模糊效果方法

//模糊圖象效果

- (void)moHuXiaoGuo{

/*

UIBlurEffect 的種類

UIBlurEffect 的種類則有以下幾種可以使用：

UIBlurEffectStyleExtraLight – 模糊後加入和模糊對象相比更明亮的色相（ Hue ）調(diào)整效果

UIBlurEffectStyleLight – 模糊後加入和模糊對象相等的色相調(diào)整效果

UIBlurEffectStyleDark – 模糊後加入和模糊對象相比更暗色的色相調(diào)整效果

*/

UIImageView *imageview = [[UIImageView alloc]initWithFrame:self.view.bounds];

imageview.image = [UIImage imageNamed:@"6.jpg"];

imageview.contentMode = UIViewContentModeScaleAspectFit;

imageview.userInteractionEnabled = YES;

[self.view addSubview:imageview];

UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];

UIVisualEffectView *effectview = [[UIVisualEffectView alloc] initWithEffect:blur];

//大概或許能通過透明度 改變模糊的值? 不理想

effectview.alpha = 0.2;

effectview.frame = CGRectMake(0, 0, imageview.bounds.size.width, 600);

[imageview addSubview:effectview];

UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];

btn.frame = CGRectMake(10, 50, 100, 40);

[btn setTitle:@"btn" forState:UIControlStateNormal];

[effectview.contentView addSubview:btn];