使用CAGradientLayer實(shí)現(xiàn)漸變色效果

#define kRGBColor(r, g, b, a)  [UIColor colorWithRed:(r) / 255.0 green:(g) / 255.0 blue:(b) / 255.0 alpha: a]

// 創(chuàng)建 CAGradientLayer 對(duì)象
CAGradientLayer *gradientLayer = [CAGradientLayer layer];

// 設(shè)置 gradientLayer 的 Frame
gradientLayer.frame = self.view.bounds;

// 創(chuàng)建漸變色數(shù)組，需要轉(zhuǎn)換為CGColor顏色
gradientLayer.colors = @[(id)[UIColor whiteColor].CGColor,(id)kRGBColor(30, 144, 255, 1).CGColor];

// 設(shè)置顏色分割點(diǎn)
gradientLayer.locations = @[@(0.1f) ,@(1)];

// 設(shè)置漸變顏色方向，左上點(diǎn)為(0,0), 右下點(diǎn)為(1,1)
gradientLayer.startPoint = CGPointMake(0, 0);
gradientLayer.endPoint = CGPointMake(0, 1);

// 添加漸變色到創(chuàng)建的 UIView 上
[self.view.layer addSublayer:gradientLayer];

毛玻璃效果

 // 創(chuàng)建imageView    
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 240, self.view.bounds.size.width, 200)];       
[imageView setImage:[UIImage imageNamed:@"cr7.jpg"]];  
[self.view addSubview:imageView];      

// blur效果       
UIVisualEffectView *visual = [[UIVisualEffectView alloc] initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]];      
visual.frame = imageView.bounds;       
visual.alpha = 0.8f;   
[imageView addSubview:visual];