ios开发相关

1.textfield文字偏移

- (void)setTextOffsetWithLeftViewRect : (CGRect)rect WithMode :(UITextFieldViewMode)mode{

    UIView *view = [[UIView alloc]initWithFrame:rect];

    self.leftView = view;

    self.leftViewMode = mode; //枚举 默认为no 不显示leftView

}

2.

/*

colors  渐变的颜色

locations 颜色变化位置的取值范围

startPoint  颜色渐变的起始位置:取值范围在(0,0)~(1,1)之间

endPoint  颜色渐变的终点位置,取值范围也是在(0,0)~(1,1)之间

补充下:startPoint & endPoint设置为(0,0)(1.0,0)代表水平方向渐变,(0,0)(0,1.0)代表竖直方向渐变

 

*/

+ (CAGradientLayer *)setGradualChangingColor:(UIView *)view fromColor:(NSString *)fromHexColorStr toColor:(NSString *)toHexColorStr;

//绘制渐变色颜色的方法

+ (CAGradientLayer *)setGradualChangingColor:(UIView *)view fromColor:(NSString *)fromHexColorStr toColor:(NSString *)toHexColorStr{

    

    //    CAGradientLayer类对其绘制渐变背景颜色、填充层的形状(包括圆角)

    CAGradientLayer *gradientLayer = [CAGradientLayer layer];

    gradientLayer.frame = view.bounds;

    

    //  创建渐变色数组，需要转换为CGColor颜色

    gradientLayer.colors = @[(__bridge id)[self colorWithHex:fromHexColorStr].CGColor,(__bridge id)[self colorWithHex:toHexColorStr].CGColor];

    

    //  设置渐变颜色方向，左上点为(0,0), 右下点为(1,1)

    gradientLayer.startPoint = CGPointMake(0, 0);

    gradientLayer.endPoint = CGPointMake(1, 1);

    

    //  设置颜色变化点，取值范围 0.0~1.0

    gradientLayer.locations = @[@0,@1];

    

    return gradientLayer;

}