ios - 視圖 漸層

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////  YViewGradient.m//  AoleYou20170907////  Created by XY IOS on 2018/4/25.//  Copyright ? 2018年 -陳詩友. All rights reserved.//#import "YViewGradient.h"@implementation YViewGradient/** 按鈕漸層 @param viewid 按鈕 */+(void)changeAlphaWithviewID:(UIButton *)viewid{    CAGradientLayer *_gradLayer = [CAGradientLayer layer];    NSArray *colors = [NSArray arrayWithObjects:                       (id)[[UIColor colorWithWhite:0 alpha:1] CGColor],                       (id)[[UIColor colorWithWhite:0 alpha:0.8] CGColor],                       (id)[[UIColor colorWithWhite:0 alpha:0.6] CGColor],                       nil];    [_gradLayer setColors:colors];    //漸層起止點，point表示向量    [_gradLayer setStartPoint:CGPointMake(1.0f, 0.0f)];    [_gradLayer setEndPoint:CGPointMake(0.0f, 0.0f)];    [_gradLayer setFrame:viewid.bounds];    [viewid.layer setMask:_gradLayer];}@end

 

ios - 視圖 漸層