iOS开发UI篇——Core Animation核心动画CAGradientLayer(实现渐变色等)简介

一、CAGradientLayer实现渐变色(设置tableView背景为渐变色)

[self.view setBackgroundColor:[UIColor whiteColor]];
UITableView *table = [[UITableView alloc] initWithFrame:CGRectMake(0,0, mainWidth, mainHeight-64)];
table.separatorStyle = UITableViewCellSeparatorStyleNone;
//当设置layer渐变色时,一定要把view的颜色设置为透明,要不会被覆盖
[table setBackgroundColor:[UIColor clearColor]];
//设置颜色值 
UIColor *_inputColor0 = [UIColor redColor];
UIColor *_inputColor1 = [UIColor orangeColor];
//1.创建layer
CAGradientLayer *redLayer2 = [CAGradientLayer new];
//2.可以添加多种颜色,这里只设置两种颜色
 redLayer2.colors = @[(__bridge id)_inputColor1.CGColor, (__bridge id)_inputColor0.CGColor];
//3.设置渐变颜色方向,左上点为(0,0), 右下点为(0,1)
redLayer2.startPoint = CGPointMake(0, 0);
redLayer2.endPoint = CGPointMake(0, 1);
redLayer2.frame = self.secondTable.frame;
//4.将layer添加到视图上
[self.view.layer addSublayer:redLayer2];
[self.view addSubview:table];
posted @ 2017-06-14 09:24  TheYouth  阅读(1304)  评论(0编辑  收藏  举报