Masonry是一個輕量級的佈局框架 擁有本身的描述語法 採用更優雅的鏈式語法封裝自動佈局 簡潔明瞭 並具備高可讀性。比咱們使用自動佈局,繁瑣的約束條件,好用多了。下面咱們來學學masonry的使用方法。git
首先咱們要下載Masonry源碼。源碼地址以下:github
https://github.com/Masonry/Masonry框架
將源碼下載下來後,能夠直接編譯過使用的。函數
而後將源碼中的Masonry和Headers目錄下的文件拷貝到咱們的工程中,並添加進項目中。並在項目的編譯設置中的header search paths 選項中增長$(SRCROOT)/Headers 和$(SRCROOT)/Masonry佈局
而後在咱們的項目預編譯文件中增長atom
#import "Masonry.h"spa
而後咱們就可使用masonry的語句來設置咱們的界面了。下面咱們開始吧。orm
Masonry 支持的經常使用屬性以下:對象
@property (nonatomic, strong, readonly) MASConstraint *left;ip
@property (nonatomic, strong, readonly) MASConstraint *top;
@property (nonatomic, strong, readonly) MASConstraint *right;
@property (nonatomic, strong, readonly) MASConstraint *bottom;
@property (nonatomic, strong, readonly) MASConstraint *leading;
@property (nonatomic, strong, readonly) MASConstraint *trailing;
@property (nonatomic, strong, readonly) MASConstraint *width;
@property (nonatomic, strong, readonly) MASConstraint *height;
@property (nonatomic, strong, readonly) MASConstraint *centerX;
@property (nonatomic, strong, readonly) MASConstraint *centerY;
@property (nonatomic, strong, readonly) MASConstraint *baseline;
這些屬性與NSLayoutAttrubute的對照表以下:
· 首先在Masonry中可以添加autolayout約束有三個函數
- (NSArray *)mas_makeConstraints:(void(^)(MASConstraintMaker *make))block;
- (NSArray *)mas_updateConstraints:(void(^)(MASConstraintMaker *make))block;
- (NSArray *)mas_remakeConstraints:(void(^)(MASConstraintMaker *make))block;
mas_makeConstraints 只負責新增約束 Autolayout不能同時存在兩條針對於同一對象的約束 不然會報錯
mas_updateConstraints 針對上面的狀況 會更新在block中出現的約束 不會致使出現兩個相同約束的狀況
mas_remakeConstraints 則會清除以前的全部約束 僅保留最新的約束
三種函數善加利用 就能夠應對各類狀況了
一個小例子:
//今後之後基本能夠拋棄CGRectMake了
UIView *sv = [UIView new];
//在作autoLayout以前 必定要先將view添加到superview上 不然會報錯
[self.view addSubview:sv];
//mas_makeConstraints就是Masonry的autolayout添加函數 將所需的約束添加到block中行了
[sv mas_makeConstraints:^(MASConstraintMaker *make) {
//將sv居中(很容易理解吧?)
make.center.equalTo(ws.view);
//將size設置成(300,300)
make.size.mas_equalTo(CGSizeMake(300, 300));
}];
equalTo 和 mas_equalTo的區別在哪裏呢? 其實 mas_equalTo是一個MACRO,比較的是值,equalTo比較的是view。
小例子二:
UIView *sv1 = [UIView new];
sv1.backgroundColor = [UIColor redColor];
[sv addSubview:sv1];
[sv1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(sv).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));
}];
UIView *sv2 = [UIView new];
UIView *sv3 = [UIView new];
sv2.backgroundColor = [UIColor greenColor];
sv3.backgroundColor = [UIColor blueColor];
[sv addSubview:sv2];
[sv addSubview:sv3];
int padding1 = 10;
[sv2 mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerY.mas_equalTo(sv.mas_centerY);
make.left.equalTo(sv.mas_left).with.offset(padding1);
make.right.equalTo(sv3.mas_left).with.offset(-padding1);
make.height.mas_equalTo(@150);
make.width.equalTo(sv3);
}];
[sv3 mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerY.mas_equalTo(sv.mas_centerY);
make.left.equalTo(sv2.mas_right).with.offset(padding1);
make.right.equalTo(sv.mas_right).with.offset(-padding1);
make.height.mas_equalTo(@150);
make.width.equalTo(sv2);
}];
效果以下:
例子三:
[self.mobileView mas_makeConstraints:^(MASConstraintMaker *make){
make.left.equalTo(self.view.mas_left).with.offset(0);
make.right.equalTo(self.view.mas_right).with.offset(0);
make.top.equalTo(self.view.mas_top).with.offset(MobileView_To_Top);
make.height.mas_equalTo(@Height_of_MobileView);
make.width.equalTo(self.view);
}];
[self.tipLabel mas_makeConstraints:^(MASConstraintMaker *make){
make.left.equalTo(self.view.mas_left).with.offset(0);
make.right.equalTo(self.view.mas_right).with.offset(0);
make.top.equalTo(self.view.mas_top).with.offset(Tiplabel_To_Top);
make.height.mas_equalTo(@Height_of_TipLabel);
make.width.equalTo(self.view);
}];
[self.nextButton mas_makeConstraints:^(MASConstraintMaker *make){
make.left.equalTo(self.view.mas_left).with.offset(NextButton_To_Left);
make.right.equalTo(self.view.mas_right).with.offset(-NextButton_To_Left);
make.top.equalTo(self.view.mas_top).with.offset(NextButton_To_Top);
make.height.mas_equalTo(@Height_of_NextButton);
}];
注意在xib或者storyboard中使用masonry框架相關方法的時候要將use Auto layout選項去掉,不然會不起做用。