图片适配、控件适配，xib适配。Masonry
//图片适配
//3gs和4的屏幕缩放系数是1. 4s~6s屏幕缩放系数是2. 6+和6s+缩放系数是3.一张20x20的图片,在3gs和4上正常显示,在缩放系数是2或者3的设备上会被放大缩放(模糊),在2上两倍,在3上三倍.所以我们现在一般只做两倍和三倍图.
//如果没有三倍图,会自动找到2倍图放大
//example.png example@2x.png example@3x.png 加载图片用:imageNamed:@"example.png"
//PDF不失真
//NSString *path = [[NSBundle mainBundle] pathForResource:@"0" ofType:@"png"];
//_imageView.image = [UIImage imageWithContentsOfFile:path];
_imageView.image= [UIImageimageNamed:@"脸"];
//字体有大有小字体颜色不会失真，颜色是矢量数据
NSLog(@"%@",[UIFont familyNames]);
//设置字体类型和大小
//[UIFont fontWithName:<#(nonnull NSString *)#> size:<#(CGFloat)#>];
用于生成各种需要的Icon的软件
//控件适配
//使用第三方库Masonry进行约束适配
UIView *titleView = [[UIView alloc] init];
titleView.backgroundColor= [UIColor redColor];
//对视图进行约束之前,要保证该视图已经添加到其父视图上
[self.view addSubview:titleView];
//Masonry的使用
[titleView mas_makeConstraints:^(MASConstraintMaker*make) {
//顶部的偏移量为0
make.top.offset(0);
//左侧的偏移量为0
make.left.offset(0);
//右侧的偏移量为0
make.right.offset(0);
//定高度
make.height.offset(60);
}];
UIView *bgView = [[UIView alloc] init];
bgView.backgroundColor= [UIColor orangeColor];
[self.view addSubview:bgView];
[bgView mas_makeConstraints:^(MASConstraintMaker*make) {
make.top.offset(20);
make.left.offset(20);
//右下位置为正
//左上位置为负
make.right.offset(-20);
make.bottom.offset(-20);
}];
UIView *view1 = [[UIView alloc] init];
view1.backgroundColor= [UIColor cyanColor];
[bgView addSubview:view1];
UIView *view2 = [[UIView alloc] init];
view2.backgroundColor= [UIColorcyanColor];
[bgView addSubview:view2];
//等距等宽等高
[view1 mas_makeConstraints:^(MASConstraintMaker*make) {
//等高
make.top.offset(20);
make.bottom.offset(-20);
//等距
make.left.offset(20);
make.right.equalTo(view2.mas_left).offset(-20);
//view1和view2等宽
make.width.equalTo(view2.mas_width);
}];
[view2 mas_makeConstraints:^(MASConstraintMaker*make) {
//等高
make.top.offset(20);
make.bottom.offset(-20);
//等距
make.right.offset(-20);
}];
//适配的缩放匹配
UIView *view = [[UIView alloc] init];
view.backgroundColor= [UIColor greenColor];
[self.view addSubview:view];
[view mas_makeConstraints:^(MASConstraintMaker*make) {
make.top.offset(0);
make.left.offset(0);
// make.width.offset(self.view.frame.size.width/2);
//multipliedBy缩放系数
make.width.equalTo(self.view.mas_width).multipliedBy(0.5);
make.height.equalTo(self.view.mas_height).multipliedBy(0.5);
}];
//XIB适配
//使用xib约束,上,下,左,右,长度,高度,只需要四个即可约束
//不需要外边框Constrain to margins
//对于提示错误或者警告,可以对其进行点击修正,之后要update
//等宽,等高都可以使用
//点击约束线条可以设置比例
//对于要设置子视图的关系比例,可以选中子视图及其需要成为父视图的选项,进行约束
